[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Xen-devel] "tcp: refine TSO autosizing" causes performance regression on Xen
- To: Eric Dumazet <eric.dumazet@xxxxxxxxx>
- From: Rick Jones <rick.jones2@xxxxxx>
- Date: Wed, 15 Apr 2015 11:19:15 -0700
- Cc: Jonathan Davies <Jonathan.Davies@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxxxxx>, netdev <netdev@xxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Eric Dumazet <edumazet@xxxxxxxxxx>, Paul Durrant <paul.durrant@xxxxxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, Felipe Franciosi <felipe.franciosi@xxxxxxxxxx>, Christoffer Dall <christoffer.dall@xxxxxxxxxx>, David Vrabel <david.vrabel@xxxxxxxxxx>
- Delivery-date: Wed, 15 Apr 2015 18:19:26 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On 04/15/2015 11:08 AM, Eric Dumazet wrote:
On Wed, 2015-04-15 at 10:55 -0700, Rick Jones wrote:
Have you tested this patch on a NIC without GSO/TSO ?
This would allow more than 500 packets for a single flow.
Hello bufferbloat.
Woudln't the fq_codel qdisc on that interface address that problem?
Last time I checked, default qdisc was pfifo_fast.
Bummer.
These guys do not want to change a sysctl, how pfifo_fast will magically
becomes fq_codel ?
Well, I'm not sure that it is George and Jonathan themselves who don't
want to change a sysctl, but the customers who would have to tweak that
in their VMs?
rick
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel
|
