netdev - RE: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel

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Date:	Tue, 12 Apr 2011 13:18:44 +0800
From:	Wei Gu <wei.gu@...csson.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Alexander Duyck <alexander.h.duyck@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	netdev <netdev@...r.kernel.org>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: RE: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel

Hi,
It doesn't looks any better by pass this param to kernel

  kernel /vmlinuz-2.6.35.2 ro root=UUID=e96f9df8-c28a-4ea8-ac26-64fbf948bce2 rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.iso88591 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=sv-latin1 crashkernel=auto pci=bfsort rhgb quiet console=tty0 console=ttyS0,115200 processor.max_cstate=1


-----Original Message-----
From: Eric Dumazet [mailto:eric.dumazet@...il.com]
Sent: Tuesday, April 12, 2011 12:57 PM
To: Wei Gu
Cc: Alexander Duyck; Peter Zijlstra; netdev; Kirsher, Jeffrey T
Subject: RE: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel

Le mardi 12 avril 2011 à 12:40 +0800, Wei Gu a écrit :
> Hi,
> I found the problem was introduced by this revert patch "2010-08-13
> Peter Zijlstra  sched: Revert nohz_ratelimit() for now"
>
> I tried the remove this patch from 2.6.35.2 and then build the
> application again, then the ixgbe driver looks works fine.
> I don't know why this time revert the  nohz_ratelimit() will cause the
> problem on ixgbe driver, since this  nohz_ratelimit was first
> introduced "2010-03-11". And before that time with 2.6.32 kernel it
> also doesn't have this problem with ixgbe driver.
>
>
> Some log from git:
> ======================================================================
> ===================
> 2.6.35.2
> 2010-08-13      Peter Zijlstra  sched: Revert nohz_ratelimit() for now
> 2.6.35.1
> 2010-08-01      Linus Torvalds  Linux 2.6.35 v2.6.35
> 2010-06-17      Peter Zijlstra  nohz: Fix nohz ratelimit
> 2.6.35-rc3
> 2010-03-11      Mike Galbraith  sched: Rate-limit nohz
>
> Thanks
> WeiGu
>

Hmm...

Could you try to add "processor.max_cstate=1" to boot parameters ?



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