netdev - Re: Bad network performance over 2Gbps

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Message-ID: <175f5a0f0804151315x1e192fc7p7dac1e84fd154211@mail.gmail.com>
Date:	Tue, 15 Apr 2008 22:15:14 +0200
From:	"H. Willstrand" <h.willstrand@...il.com>
To:	"Anton Titov" <a.titov@...t.bg>, netdev@...r.kernel.org
Subject: Re: Bad network performance over 2Gbps

[Changed mail list]

On Tue, Apr 15, 2008 at 8:06 PM, Anton Titov <a.titov@...t.bg> wrote:
> I use Linux for serving a huge amount of static web on few servers. When
>  network traffic goes above 2Gbit/sec ksoftirqd/5 (not every time 5, but
>  every time just one) starts using exactly 100% CPU time and packet
>  packet loss starts preventing traffic from going up. When the network
>  traffic is lower than 1.9Gbit ksoftirqds use 0% CPU according to top.
>
>  Uplink is 6 gigabit Intel cards bonded together using 802.3ad algorithm
>  with xmit_hash_policy set to layer3+4. On the other side is Cisco 2960
>  switch. Machine is with two quad core Intel Xeons @2.33GHz.
>
>  Here goes a screen snapshot of "top" command. The described behavior
>  have nothing to do with 13% io-wait. It happens even if it is 0%
>  io-wait.
>  http://www.titov.net/misc/top-snap.png
>
>  kernel configuration:
>  http://www.titov.net/misc/config.gz
>
>  /proc/interrupts, lspci, dmesg (nothing intresting there), ifconfig,
>  uname -a:
>  http://www.titov.net/misc/misc.txt.gz
>
>  Is it a Linux bug or some hardware limitation?
>
>  Regards,
>  Anton Titov
>
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