netdev - Re: [PATCH net-next] rps: introduce a new sysctl switch rps_workaround_buggy

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Message-ID: <4F7E4FCD.7050501@gmail.com>
Date:	Fri, 06 Apr 2012 10:07:09 +0800
From:	Li Yu <raise.sail@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] rps: introduce a new sysctl switch rps_workaround_buggy_driver

于 2012年04月05日 19:07, Eric Dumazet 写道:
> On Thu, 2012-04-05 at 18:31 +0800, Li Yu wrote:
>> We encountered a buggy NIC driver or hardware/firmware, it keeps
>> non-zero constant skb->rxhash for long time, so if we enabled RPS,
>> the targeted CPU keeps same for long time too.
>>
>> This patch introduces a sysctl switch to workaround for such problem,
>> if the switch was on, RPS core discards the skb->rxhash that is
>> computed by NIC hardware.
>>
>> Hope this patch also can help others, thanks.
>
> Really ?
>
> to disable this driver rxhash, you should try :
>
> ethtool -K eth0 rxhash off
>
>

Great! I really did not know this new option ago,
and wrote a kprobe workaround module. It seem that
ethtool 2.6.39 have such support at least.

Thank you very much!

Yu

>
>

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