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

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Message-ID: <1333624027.18626.579.camel@edumazet-glaptop>
Date:	Thu, 05 Apr 2012 13:07:07 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Li Yu <raise.sail@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] rps: introduce a new sysctl switch
 rps_workaround_buggy_driver

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



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