On Thu, Mar 01, 2012 at 10:07:43PM -0500, David Miller wrote:> From: Alex Shi<alex.shi@xxxxxxxxx>Yes, probably, as we did find some clue related with the tcp_r/wmem.
> Date: Fri, 02 Mar 2012 10:45:17 +0800
>> > Add CC to tang feng, He is working on this issue.> > Is he? I'm pretty sure this is due to the TCP receive window growing
> issue Eric Dumazet, Neal Cardwell and I are discussing in the thread
> starting at:
> > http://marc.info/?l=linux-netdev&m=132916352815286&w=2
Here is the regression we found:
On some machines, we found there is about 10% resgression of netperf
TCP-64K loopback test between 3.2 and 3.3-rc1. The exact test is:
./netperf -t TCP_STREAM -l 60 -H 127.0.0.1 -i 50,3 -I 99,5 -- -s 32768 -S 32768 -m 4096
The test machine is a 2 socket Quad Core Core 2 Duo server(2.66GHz) with
8 GB RAM. Following are the debug info (ifconfig/netstat -s/tcp_rwmem)
before and after the test:
The most obvious differences I can see are:
1) 311 GB vs 241 GB from ifconfig
2) the difference of the tcp_r/wmem