netdev - RE: [PATCH 22/29] net_dma: poll for a descriptor after allocation failure

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Date:	Mon, 14 Sep 2009 16:00:52 +0100
From:	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>
To:	"Williams, Dan J" <dan.j.williams@...el.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH 22/29] net_dma: poll for a descriptor after allocation
 failure

Williams, Dan J wrote:
> Handle descriptor allocation failures by polling for a descriptor.  The
> driver will force forward progress when polled.  In the best case this
> polling interval will be the time it takes for one dma memcpy
> transaction to complete.  In the worst case, channel hang, we will need
> to wait 100ms for the cleanup watchdog to fire (ioatdma driver).
> 
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---

Signed-off-by: Maciej Sosnowski <maciej.sosnowski@...el.com>--
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