From: zhou rui <zhourui.cn@gmail.com>
To: netdev@vger.kernel.org
Cc: jon.zhou@jdsu.com
Subject: same application has different performance with kernel 2.6.32/34/36
Date: Fri, 29 Apr 2011 22:46:04 +0800 [thread overview]
Message-ID: <BANLkTinF8Mfs+pqfGV0bLqm_3VyKCMn0LA@mail.gmail.com> (raw)
hi
my test application add a packet hook via dev_add_pack(&prot_hook);
then copy the packet to a shared memory between userspace and kernel
tests wereperformed at same machine(DL380 G7, 12cores, intel X520 10G
nic),same traffic,same nic driver(ixgbe 3.3.9)
kernel 2.6.32.12 (SUSE SLES11,SP1)
APPlication cpu usage: 5-6%
kernel updated to 2.6.34.7
APPlication cpu usage: 19-25%
kernel 2.6.36.4 (enable/disable RPS)
APPlication cpu usage 35-40%
before I installing profile tool to find the root cause, any idea about it?
'top' result is not accurate in older kernel? or any kernel
module/feature impact this?
next reply other threads:[~2011-04-29 14:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-29 14:46 zhou rui [this message]
2011-04-29 15:48 ` same application has different performance with kernel 2.6.32/34/36 Stephen Hemminger
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