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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] xen/netfront: improve truesize tracking
Thursday, December 20, 2012, 1:51:39 PM, you wrote:
> Wednesday, December 19, 2012, 5:17:49 PM, you wrote:
>> On Wed, 2012-12-19 at 12:34 +0100, Sander Eikelenboom wrote:
>>> Hi Ian,
>>>
>>> It ran overnight and i haven't seen the warn_once trigger.
>>> (but i also didn't with the previous patch)
>>>
>> As I said, the miminum value to not trigger the warning was what Ian
>> patch was doing, but it was still a not accurate estimation.
>> Doing the real accounting might trigger slow transferts, or dropped
>> packets because of socket limits (SNDBUF / RCVBUF) being hit sooner.
>> So the real question was : If accounting for full pages, is your
>> applications run as smooth as before, with no huge performance
>> regression ?
> Ok i have added some extra debug info (see diff's below), the code still uses
> the old calculation for truesize (in the hope to trigger the warn_on_once
> again), but also calculates the variants IanC came up with.
> I haven't got a clear test case to trigger the warn_on_once, it happens just
> every once in a while during my normal usage and i'm not a netperf expert :-)
> So at the moment i haven't been able to trigger the warn_on_once yet, but the
> results so far do seem to shed some light ..
> - The first variant (current code) seems to be the most effcient and a good
> estimation *most* of the the, but sometimes triggers the warn_on_once in
> skb_try_coalesce.
> - The first variant (current code) seems to always substract from the
> truesize for small packets.
> - The second variant always seems keep the truesize as is for most of the
> small network traffic, but it also seems to work ok for larger packets.
> - The third variant seems to be a pretty wasteful estimation.
> So the last variant seems to be rather wasteful, and the second one the most
> accurate so far.
> Eric:
> From the warn_on_once, delta should be smaller than len, but probably
> they should be as close together as possible.
> When you say "accurate estimation", what would be a acceptable
> difference between DELTA and LEN ?
> [ 116.965062] eth0: mtu:1500 data_len:42 len before:0 len after:42 truesize
> before:896 truesize after:682 nr_frags:1 variant1:-214(682) variant2:0(896)
> variant3:4096(4992)
> [ 117.094538] eth0: mtu:1500 data_len:54 len before:0 len after:54 truesize
> before:896 truesize after:694 nr_frags:1 variant1:-202(694) variant2:0(896)
> variant3:4096(4992)
> [ 117.094707] eth0: mtu:1500 data_len:54 len before:0 len after:54 truesize
> before:896 truesize after:694 nr_frags:1 variant1:-202(694) variant2:0(896)
> variant3:4096(4992)
> [ 117.094869] eth0: mtu:1500 data_len:54 len before:0 len after:54 truesize
> before:896 truesize after:694 nr_frags:1 variant1:-202(694) variant2:0(896)
> variant3:4096(4992)
> [ 117.095058] eth0: mtu:1500 data_len:54 len before:0 len after:54 truesize
> before:896 truesize after:694 nr_frags:1 variant1:-202(694) variant2:0(896)
> variant3:4096(4992)
> [ 117.095216] eth0: mtu:1500 data_len:54 len before:0 len after:54 truesize
> before:896 truesize after:694 nr_frags:1 variant1:-202(694) variant2:0(896)
> variant3:4096(4992)
> [ 117.096102] eth0: mtu:1500 data_len:54 len before:0 len after:54 truesize
> before:896 truesize after:694 nr_frags:1 variant1:-202(694) variant2:0(896)
> variant3:4096(4992)
> [ 117.096311] eth0: mtu:1500 data_len:54 len before:0 len after:54 truesize
> before:896 truesize after:694 nr_frags:1 variant1:-202(694) variant2:0(896)
> variant3:4096(4992)
> [ 117.096373] eth0: mtu:1500 data_len:54 len before:0 len after:54 truesize
> before:896 truesize after:694 nr_frags:1 variant1:-202(694) variant2:0(896)
> variant3:4096(4992)
> [ 117.150398] eth0: mtu:1500 data_len:54 len before:0 len after:54 truesize
> before:896 truesize after:694 nr_frags:1 variant1:-202(694) variant2:0(896)
> variant3:4096(4992)
> [ 117.150459] eth0: mtu:1500 data_len:54 len before:0 len after:54 truesize
> before:896 truesize after:694 nr_frags:1 variant1:-202(694) variant2:0(896)
> variant3:4096(4992)
> [ 117.536901] eth0: mtu:1500 data_len:53642 len before:0 len after:53642
> truesize before:896 truesize after:54282 nr_frags:14 variant1:53386(54282)
> variant2:53386(54282) variant3:57344(58240)
> [ 117.537463] eth0: mtu:1500 data_len:15994 len before:0 len after:15994
> truesize before:896 truesize after:16634 nr_frags:5 variant1:15738(16634)
> variant2:15738(16634) variant3:20480(21376)
> [ 117.537915] eth0: mtu:1500 data_len:17442 len before:0 len after:17442
> truesize before:896 truesize after:18082 nr_frags:5 variant1:17186(18082)
> variant2:17186(18082) variant3:20480(21376)
> [ 117.538543] eth0: mtu:1500 data_len:18890 len before:0 len after:18890
> truesize before:896 truesize after:19530 nr_frags:6 variant1:18634(19530)
> variant2:18634(19530) variant3:24576(25472)
> [ 117.539223] eth0: mtu:1500 data_len:13098 len before:0 len after:13098
> truesize before:896 truesize after:13738 nr_frags:4 variant1:12842(13738)
> variant2:12842(13738) variant3:16384(17280)
> [ 117.539283] eth0: mtu:1500 data_len:7306 len before:0 len after:7306
> truesize before:896 truesize after:7946 nr_frags:2 variant1:7050(7946)
> variant2:7050(7946) variant3:8192(9088)
> [ 117.539403] skbuff: to: (null) from: (null) skb_try_coalesce: DELTA - LEN
> > 100 delta:7690 len:7240 from->truesize:7946 skb_headlen(from):190
> skb_shinfo(to)->nr_frags:5 skb_shinfo(from)->nr_frags:2
> [ 117.540035] eth0: mtu:1500 data_len:4410 len before:0 len after:4410
> truesize before:896 truesize after:5050 nr_frags:3 variant1:4154(5050)
> variant2:4304(5200) variant3:12288(13184)
> [ 117.540153] eth0: mtu:1500 data_len:1018 len before:0 len after:1018
> truesize before:896 truesize after:1658 nr_frags:1 variant1:762(1658)
> variant2:762(1658) variant3:4096(4992)
> [ 121.981917] net_ratelimit: 27 callbacks suppressed
> [ 121.981960] eth0: mtu:1500 data_len:42 len before:0 len after:42 truesize
> before:896 truesize after:682 nr_frags:1 variant1:-214(682) variant2:0(896)
> variant3:4096(4992)
> [ 122.985019] eth0: mtu:1500 data_len:42 len before:0 len after:42 truesize
> before:896 truesize after:682 nr_frags:1 variant1:-214(682) variant2:0(896)
> variant3:4096(4992)
> [ 123.988308] eth0: mtu:1500 data_len:42 len before:0 len after:42 truesize
> before:896 truesize after:682 nr_frags:1 variant1:-214(682) variant2:0(896)
> variant3:4096(4992)
> [ 124.991961] eth0: mtu:1500 data_len:42 len before:0 len after:42 truesize
> before:896 truesize after:682 nr_frags:1 variant1:-214(682) variant2:0(896)
> variant3:4096(4992)
> [ 125.995003] eth0: mtu:1500 data_len:42 len before:0 len after:42 truesize
> before:896 truesize after:682 nr_frags:1 variant1:-214(682) variant2:0(896)
> variant3:4096(4992)
> [ 126.998324] eth0: mtu:1500 data_len:42 len before:0 len after:42 truesize
> before:896 truesize after:682 nr_frags:1 variant1:-214(682) variant2:0(896)
> variant3:4096(4992)
> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> index c26e28b..8833e38 100644
> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -964,6 +964,7 @@ static int xennet_poll(struct napi_struct *napi, int
> budget)
> struct sk_buff_head tmpq;
> unsigned long flags;
> int err;
> + int tsz,len;
> spin_lock(&np->rx_lock);
> @@ -1037,9 +1038,22 @@ err:
> * receive throughout using the standard receive
> * buffer size was cut by 25%(!!!).
> */
> - skb->truesize += skb->data_len - RX_COPY_THRESHOLD;
> +
> +
> +
> +
> + tsz = skb->truesize;
> + len = skb->len;
> + /* skb->truesize += PAGE_SIZE * skb_shinfo(skb)->nr_frags; */
> + skb->truesize += skb->data_len - RX_COPY_THRESHOLD;
> skb->len += skb->data_len;
> + net_warn_ratelimited("%s: mtu:%d data_len:%d len before:%d
> len after:%d truesize before:%d truesize after:%d nr_frags:%d variant1:%d(%d)
> variant2:%d(%d) variant3:%d(%d) \n",
> + skb->dev->name, skb->dev->mtu, skb->data_len, len,
> skb->len,tsz, skb->truesize, skb_shinfo(skb)->nr_frags,
> + skb->data_len - RX_COPY_THRESHOLD, tsz +
> skb->data_len - RX_COPY_THRESHOLD ,
> + skb->data_len - NETFRONT_SKB_CB(skb)->pull_to, tsz +
> skb->data_len - NETFRONT_SKB_CB(skb)->pull_to,
> + PAGE_SIZE * skb_shinfo(skb)->nr_frags, tsz +
> (PAGE_SIZE * skb_shinfo(skb)->nr_frags));
> +
> if (rx->flags & XEN_NETRXF_csum_blank)
> skb->ip_summed = CHECKSUM_PARTIAL;
> else if (rx->flags & XEN_NETRXF_data_validated)
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index 3ab989b..6d0cd86 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -3471,6 +3471,16 @@ bool skb_try_coalesce(struct sk_buff *to, struct
> sk_buff *from,
> WARN_ON_ONCE(delta < len);
> + if(delta < len) {
> + net_warn_ratelimited("to: %s from: %s skb_try_coalesce:
> DELTA < LEN delta:%d len:%d from->truesize:%d skb_headlen(from):%d
> skb_shinfo(to)->nr_frags:%d skb_shinfo(from)->nr_frags:%d \n",
> + to->dev->name, from->dev->name, delta, len,
> from->truesize, skb_headlen(from), skb_shinfo(to)->nr_frags,
> skb_shinfo(from)->nr_frags);
> + }
> +
+ if (delta >> len && delta - len > 100) {
> + net_warn_ratelimited("to: %s from: %s skb_try_coalesce:
> DELTA - LEN > 100 delta:%d len:%d from->truesize:%d skb_headlen(from):%d
> skb_shinfo(to)->nr_frags:%d skb_shinfo(from)->nr_frags:%d \n",
> + to->dev->name,from->dev->name, delta, len,
> from->truesize, skb_headlen(from), skb_shinfo(to)->nr_frags,
> skb_shinfo(from)->nr_frags);
> + }
> +
> memcpy(skb_shinfo(to)->frags + skb_shinfo(to)->nr_frags,
> skb_shinfo(from)->frags,
> skb_shinfo(from)->nr_frags * sizeof(skb_frag_t));
Ok i succeeded in triggering the warn_on_once, but it seems the extra debug
info from netfront was just rate limited away for the offending packet :(
Dec 20 15:17:33 media kernel: [ 393.464062] eth0: mtu:1500 data_len:66 len
before:0 len after:66 truesize before:896 truesize after:706 nr_frags:1
variant1:-190(706) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:33 media kernel: [ 393.464438] eth0: mtu:1500 data_len:762 len
before:0 len after:762 truesize before:896 truesize after:1402 nr_frags:1
variant1:506(1402) variant2:506(1402) variant3:4096(4992)
Dec 20 15:17:33 media kernel: [ 393.465083] eth0: mtu:1500 data_len:118 len
before:0 len after:118 truesize before:896 truesize after:758 nr_frags:1
variant1:-138(758) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:33 media kernel: [ 393.466114] eth0: mtu:1500 data_len:118 len
before:0 len after:118 truesize before:896 truesize after:758 nr_frags:1
variant1:-138(758) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:33 media kernel: [ 393.467336] eth0: mtu:1500 data_len:66 len
before:0 len after:66 truesize before:896 truesize after:706 nr_frags:1
variant1:-190(706) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:35 media kernel: [ 394.940211] ------------[ cut here
]------------
Dec 20 15:17:35 media kernel: [ 394.940259] WARNING: at net/core/skbuff.c:3472
skb_try_coalesce+0x3fc/0x470()
Dec 20 15:17:35 media kernel: [ 394.940282] Modules linked in:
Dec 20 15:17:35 media kernel: [ 394.940306] Pid: 2632, comm: glusterfs Not
tainted 3.7.0-rc0-20121220-netfrontdebug1 #1
Dec 20 15:17:35 media kernel: [ 394.940330] Call Trace:
Dec 20 15:17:35 media kernel: [ 394.940343] <IRQ> [<ffffffff8106889a>]
warn_slowpath_common+0x7a/0xb0
Dec 20 15:17:35 media kernel: [ 394.940384] [<ffffffff810688e5>]
warn_slowpath_null+0x15/0x20
Dec 20 15:17:35 media kernel: [ 394.940409] [<ffffffff8184298c>]
skb_try_coalesce+0x3fc/0x470
Dec 20 15:17:35 media kernel: [ 394.940434] [<ffffffff818fb049>]
tcp_try_coalesce+0x69/0xc0
Dec 20 15:17:35 media kernel: [ 394.940458] [<ffffffff818fb0f4>]
tcp_queue_rcv+0x54/0x100
Dec 20 15:17:35 media kernel: [ 394.940481] [<ffffffff8190029f>] ?
tcp_mtup_init+0x2f/0x90
Dec 20 15:17:35 media kernel: [ 394.940504] [<ffffffff818ffbdb>]
tcp_rcv_established+0x2bb/0x6a0
Dec 20 15:17:35 media kernel: [ 394.940528] [<ffffffff8190839f>] ?
tcp_v4_rcv+0x6cf/0xb10
Dec 20 15:17:35 media kernel: [ 394.940551] [<ffffffff81907985>]
tcp_v4_do_rcv+0x135/0x480
Dec 20 15:17:35 media kernel: [ 394.940576] [<ffffffff819b3532>] ?
_raw_spin_lock_nested+0x42/0x50
Dec 20 15:17:35 media kernel: [ 394.940600] [<ffffffff8190839f>] ?
tcp_v4_rcv+0x6cf/0xb10
Dec 20 15:17:35 media kernel: [ 394.940623] [<ffffffff8190862d>]
tcp_v4_rcv+0x95d/0xb10
Dec 20 15:17:35 media kernel: [ 394.940666] [<ffffffff810b5688>] ?
lock_acquire+0xd8/0x100
Dec 20 15:17:35 media kernel: [ 394.940694] [<ffffffff818e4d6a>]
ip_local_deliver_finish+0x11a/0x230
Dec 20 15:17:35 media kernel: [ 394.940720] [<ffffffff818e4c95>] ?
ip_local_deliver_finish+0x45/0x230
Dec 20 15:17:35 media kernel: [ 394.940745] [<ffffffff818e4eb8>]
ip_local_deliver+0x38/0x80
Dec 20 15:17:35 media kernel: [ 394.940784] [<ffffffff818e447a>]
ip_rcv_finish+0x15a/0x630
Dec 20 15:17:35 media kernel: [ 394.940807] [<ffffffff818e4b68>]
ip_rcv+0x218/0x300
Dec 20 15:17:35 media kernel: [ 394.940829] [<ffffffff8184bf2d>]
__netif_receive_skb+0x65d/0x8d0
Dec 20 15:17:35 media kernel: [ 394.940853] [<ffffffff8184ba15>] ?
__netif_receive_skb+0x145/0x8d0
Dec 20 15:17:35 media kernel: [ 394.940889] [<ffffffff810b192d>] ?
trace_hardirqs_on+0xd/0x10
Dec 20 15:17:35 media kernel: [ 394.940914] [<ffffffff810fecbb>] ?
free_hot_cold_page+0x1ab/0x1e0
Dec 20 15:17:35 media kernel: [ 394.940939] [<ffffffff8184e4f8>]
netif_receive_skb+0x28/0xf0
Dec 20 15:17:35 media kernel: [ 394.940964] [<ffffffff81843e83>] ?
__pskb_pull_tail+0x253/0x340
Dec 20 15:17:35 media kernel: [ 394.941000] [<ffffffff8164fbb5>]
xennet_poll+0xae5/0xed0
Dec 20 15:17:35 media kernel: [ 394.941024] [<ffffffff81080081>] ?
wake_up_worker+0x1/0x30
Dec 20 15:17:35 media kernel: [ 394.941046] [<ffffffff810b2fbc>] ?
validate_chain+0x13c/0x1300
Dec 20 15:17:35 media kernel: [ 394.941075] [<ffffffff8184ed66>]
net_rx_action+0x136/0x260
Dec 20 15:17:35 media kernel: [ 394.941098] [<ffffffff81070551>] ?
__do_softirq+0x71/0x1a0
Dec 20 15:17:35 media kernel: [ 394.941133] [<ffffffff810705a9>]
__do_softirq+0xc9/0x1a0
Dec 20 15:17:35 media kernel: [ 394.941157] [<ffffffff819b623c>]
call_softirq+0x1c/0x30
Dec 20 15:17:35 media kernel: [ 394.941179] [<ffffffff8100fdc5>]
do_softirq+0x85/0xf0
Dec 20 15:17:35 media kernel: [ 394.941201] [<ffffffff8107041e>]
irq_exit+0x9e/0xd0
Dec 20 15:17:35 media kernel: [ 394.941235] [<ffffffff81430b1f>]
xen_evtchn_do_upcall+0x2f/0x40
Dec 20 15:17:35 media kernel: [ 394.941259] [<ffffffff819b629e>]
xen_do_hypervisor_callback+0x1e/0x30
Dec 20 15:17:35 media kernel: [ 394.941279] <EOI> [<ffffffff8100122a>] ?
xen_hypercall_xen_version+0xa/0x20
Dec 20 15:17:35 media kernel: [ 394.941318] [<ffffffff8100122a>] ?
xen_hypercall_xen_version+0xa/0x20
Dec 20 15:17:35 media kernel: [ 394.941356] [<ffffffff8100890d>] ?
xen_force_evtchn_callback+0xd/0x10
Dec 20 15:17:35 media kernel: [ 394.941381] [<ffffffff810092b2>] ?
check_events+0x12/0x20
Dec 20 15:17:35 media kernel: [ 394.941405] [<ffffffff81009259>] ?
xen_irq_enable_direct_reloc+0x4/0x4
Dec 20 15:17:35 media kernel: [ 394.941432] [<ffffffff819b3f6c>] ?
_raw_spin_unlock_irq+0x3c/0x70
Dec 20 15:17:35 media kernel: [ 394.941473] [<ffffffff81095f83>] ?
finish_task_switch+0x83/0xe0
Dec 20 15:17:35 media kernel: [ 394.941507] [<ffffffff81095f46>] ?
finish_task_switch+0x46/0xe0
Dec 20 15:17:35 media kernel: [ 394.941533] [<ffffffff819b2434>] ?
__schedule+0x444/0x880
Dec 20 15:17:35 media kernel: [ 394.941555] [<ffffffff810b2fbc>] ?
validate_chain+0x13c/0x1300
Dec 20 15:17:35 media kernel: [ 394.941580] [<ffffffff810b4c4b>] ?
__lock_acquire+0x46b/0xdd0
Dec 20 15:17:35 media kernel: [ 394.941614] [<ffffffff810b4c4b>] ?
__lock_acquire+0x46b/0xdd0
Dec 20 15:17:35 media kernel: [ 394.941638] [<ffffffff819aff95>] ?
__mutex_unlock_slowpath+0x135/0x1d0
Dec 20 15:17:35 media kernel: [ 394.941663] [<ffffffff819b2904>] ?
schedule+0x24/0x70
Dec 20 15:17:35 media kernel: [ 394.941697] [<ffffffff819b179d>] ?
schedule_hrtimeout_range_clock+0x11d/0x140
Dec 20 15:17:35 media kernel: [ 394.941725] [<ffffffff810b5688>] ?
lock_acquire+0xd8/0x100
Dec 20 15:17:35 media kernel: [ 394.941748] [<ffffffff8118a558>] ?
ep_poll+0xf8/0x3a0
Dec 20 15:17:35 media kernel: [ 394.941770] [<ffffffff819b4015>] ?
_raw_spin_unlock_irqrestore+0x75/0xa0
Dec 20 15:17:35 media kernel: [ 394.941808] [<ffffffff810b1818>] ?
trace_hardirqs_on_caller+0xf8/0x200
Dec 20 15:17:35 media kernel: [ 394.941833] [<ffffffff819b17ce>] ?
schedule_hrtimeout_range+0xe/0x10
Dec 20 15:17:35 media kernel: [ 394.941856] [<ffffffff8118a75a>] ?
ep_poll+0x2fa/0x3a0
Dec 20 15:17:35 media kernel: [ 394.941878] [<ffffffff81098630>] ?
try_to_wake_up+0x310/0x310
Dec 20 15:17:35 media kernel: [ 394.941913] [<ffffffff810b5b17>] ?
lock_release+0x117/0x250
Dec 20 15:17:35 media kernel: [ 394.941938] [<ffffffff81165fd7>] ?
fget_light+0xd7/0x140
Dec 20 15:17:35 media kernel: [ 394.941959] [<ffffffff81165f3a>] ?
fget_light+0x3a/0x140
Dec 20 15:17:35 media kernel: [ 394.941981] [<ffffffff8118a8ce>] ?
sys_epoll_wait+0xce/0xe0
Dec 20 15:17:35 media kernel: [ 394.942015] [<ffffffff819b4e69>] ?
system_call_fastpath+0x16/0x1b
Dec 20 15:17:35 media kernel: [ 394.942036] ---[ end trace 6f3a832c9e91c8af
]---
Dec 20 15:17:35 media kernel: [ 394.942056] to: (null) from: (null)
skb_try_coalesce: DELTA < LEN delta:22978 len:23168 from->truesize:23874
skb_headlen(from):0 skb_shinfo(to)->nr_frags:4 skb_shinfo(from)->nr_frags:6
Dec 20 15:17:35 media kernel: [ 394.968199] to: (null) from: (null)
skb_try_coalesce: DELTA < LEN delta:14290 len:14480 from->truesize:15186
skb_headlen(from):0 skb_shinfo(to)->nr_frags:13 skb_shinfo(from)->nr_frags:4
Dec 20 15:17:35 media kernel: [ 395.262814] net_ratelimit: 371 callbacks
suppressed
Dec 20 15:17:35 media kernel: [ 395.262858] eth0: mtu:1500 data_len:90 len
before:0 len after:90 truesize before:896 truesize after:730 nr_frags:1
variant1:-166(730) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:35 media kernel: [ 395.264767] eth0: mtu:1500 data_len:66 len
before:0 len after:66 truesize before:896 truesize after:706 nr_frags:1
variant1:-190(706) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:35 media kernel: [ 395.266193] eth0: mtu:1500 data_len:42 len
before:0 len after:42 truesize before:896 truesize after:682 nr_frags:1
variant1:-214(682) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:35 media kernel: [ 395.268422] eth0: mtu:1500 data_len:66 len
before:0 len after:66 truesize before:896 truesize after:706 nr_frags:1
variant1:-190(706) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:35 media kernel: [ 395.271617] eth0: mtu:1500 data_len:66 len
before:0 len after:66 truesize before:896 truesize after:706 nr_frags:1
variant1:-190(706) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:35 media kernel: [ 395.274794] eth0: mtu:1500 data_len:66 len
before:0 len after:66 truesize before:896 truesize after:706 nr_frags:1
variant1:-190(706) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:35 media kernel: [ 395.278104] eth0: mtu:1500 data_len:66 len
before:0 len after:66 truesize before:896 truesize after:706 nr_frags:1
variant1:-190(706) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:35 media kernel: [ 395.281319] eth0: mtu:1500 data_len:66 len
before:0 len after:66 truesize before:896 truesize after:706 nr_frags:1
variant1:-190(706) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:35 media kernel: [ 395.284454] eth0: mtu:1500 data_len:66 len
before:0 len after:66 truesize before:896 truesize after:706 nr_frags:1
variant1:-190(706) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:35 media kernel: [ 395.287797] eth0: mtu:1500 data_len:66 len
before:0 len after:66 truesize before:896 truesize after:706 nr_frags:1
variant1:-190(706) variant2:0(896) variant3:4096(4992)
Dec 20 15:17:35 media kernel: [ 395.291121] eth0: mtu:1500 data_len:66 len
before:0 len after:66 truesize before:896 truesize after:706 nr_frags:1
variant1:-190(706) variant2:0(896) variant3:4096(4992)
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