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[Xen-devel] [PATCH]fix relocation buffer size

To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>

From: Zhigang Wang <zhigang.x.wang@xxxxxxxxxx>

Date: Thu, 30 Apr 2009 14:19:26 +0800

Delivery-date: Wed, 29 Apr 2009 23:20:03 -0700

List-id: Xen developer discussion <xen-devel.lists.xensource.com>

hi, this patch adjust the relocation buffer size, it can greatly improve the ssl relocation performance (to about 1/3 compared with buffersize = 1024). here are some test results, see attachment result.txt. Signed-off-by: Zhigang Wang <zhigang.x.wang@xxxxxxxxxx> thanks, zhigang

Migration time test Conclusion: Buffer size 16K is the best choice ===================================================================================== host2: # ethtool peth0 Settings for peth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised auto-negotiation: Yes Speed: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: on Supports Wake-on: g Wake-on: d Link detected: yes # ethtool -i peth0 driver: bnx2 version: 1.7.6b firmware-version: 4.4.1 UMP 1.1.9 bus-info: 0000:03:00.0 ===================================================================================== host1: # ethtool peth0 Settings for peth0: Supported ports: [ MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised auto-negotiation: Yes Speed: 1000Mb/s Duplex: Full Port: MII PHYAD: 2 Transceiver: external Auto-negotiation: on Supports Wake-on: g Wake-on: d Link detected: yes # ethtool -i peth0 driver: forcedeth version: 0.56 firmware-version: bus-info: 0000:00:08.0 ===================================================================================== BUFFER_SIZE = 1024 source: host2, target: host1, memory: 4000, ssl: False real 0m44.047s user 0m0.064s sys 0m0.008s source: host1, target: host2, memory: 4000, ssl: False real 0m37.843s user 0m0.092s sys 0m0.012s source: host2, target: host1, memory: 4000, ssl: False real 0m47.069s user 0m0.068s sys 0m0.004s source: host1, target: host2, memory: 4000, ssl: False real 0m37.640s user 0m0.092s sys 0m0.008s source: host2, target: host1, memory: 4000, ssl: False real 0m47.524s user 0m0.056s sys 0m0.012s source: host1, target: host2, memory: 4000, ssl: False real 0m37.637s user 0m0.088s sys 0m0.020s ===================================================================================== BUFFER_SIZE = 1024 source: host2, target: host1, memory: 4000, ssl: True real 4m30.996s user 0m0.064s sys 0m0.008s source: host1, target: host2, memory: 4000, ssl: True real 4m4.462s user 0m0.076s sys 0m0.028s source: host2, target: host1, memory: 4000, ssl: True real 4m30.383s user 0m0.060s sys 0m0.016s source: host1, target: host2, memory: 4000, ssl: True real 4m5.903s user 0m0.076s sys 0m0.028s ===================================================================================== BUFFER_SIZE = 32 * 1024 source: host1, target: host2, memory: 4000, ssl: True real 1m47.328s user 0m0.092s sys 0m0.016s source: host2, target: host1, memory: 4000, ssl: True real 1m56.843s user 0m0.072s sys 0m0.000s source: host1, target: host2, memory: 4000, ssl: True real 1m46.075s user 0m0.088s sys 0m0.016s source: host2, target: host1, memory: 4000, ssl: True real 1m58.902s user 0m0.056s sys 0m0.012s ===================================================================================== BUFFER_SIZE = 32 * 1024 source: host1, target: host2, memory: 4000, ssl: False real 0m37.698s user 0m0.084s sys 0m0.016s source: host2, target: host1, memory: 4000, ssl: False real 0m44.483s user 0m0.064s sys 0m0.004s ===================================================================================== BUFFER_SIZE = 64 * 1024 source: host1, target: host2, memory: 4000, ssl: True real 1m46.347s user 0m0.088s sys 0m0.016s source: host2, target: host1, memory: 4000, ssl: True real 1m48.066s user 0m0.064s sys 0m0.008s ===================================================================================== BUFFER_SIZE = 1024 * 1024 source: host1, target: host2, memory: 4000, ssl: True real 4m48.754s user 0m0.084s sys 0m0.024s source: host2, target: host1, memory: 4000, ssl: True real 2m51.459s user 0m0.060s sys 0m0.012s ===================================================================================== BUFFER_SIZE = 16 * 1024 source: host1, target: host2, memory: 4000, ssl: True real 1m44.170s user 0m0.084s sys 0m0.020s source: host2, target: host1, memory: 4000, ssl: True real 1m59.538s user 0m0.072s sys 0m0.004s ===================================================================================== BUFFER_SIZE = 8 * 1024 source: host1, target: host2, memory: 4000, ssl: True real 2m0.496s user 0m0.092s sys 0m0.016s source: host2, target: host1, memory: 4000, ssl: True real 2m18.153s user 0m0.068s sys 0m0.012s =====================================================================================

--- xen-unstable/tools/python/xen/web/connection.py.orig 2009-04-16 08:11:54.000000000 +0800 +++ xen-unstable/tools/python/xen/web/connection.py 2009-04-16 08:12:18.000000000 +0800 @@ -37,7 +37,7 @@ for TCP and unix-domain sockets (see tcp.py and unix.py). """ -BUFFER_SIZE = 1024 +BUFFER_SIZE = 16384 BACKLOG = 5

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