netdev - Re: [PATCH -mm] [RFC] I/OAT: Handle incoming udp through ioatdma

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Date:	Thu, 29 Nov 2007 18:43:35 -0500
From:	jamal <hadi@...erus.ca>
To:	"Nelson, Shannon" <shannon.nelson@...el.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH -mm] [RFC] I/OAT: Handle incoming udp through ioatdma

On Thu, 2007-29-11 at 12:08 -0800, Nelson, Shannon wrote:
> [RFC] I/OAT: Handle incoming udp through ioatdma
> 
> From: Shannon Nelson <shannon.nelson@...el.com>
> 
> If the incoming udp packet is larger than sysctl_udp_dma_copybreak, try
> pushing it through the ioatdma asynchronous memcpy.  This is very much
> the
> same as the tcp copy offload.  This is an RFC because we know there are
> stability problems under high traffic.


What stability problems?

Is there some magic sysctl_udp_dma_copybreak threshold value where you
start seeing the benefit of IOAT-ing? Since you mentioned
"students"<evil grin here>, it would be interesting to see data where
udp starts benefitting.


cheers,
jamal

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