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From: Brice Goglin <Brice.Goglin@inria.fr>
To: Maciej Sosnowski <maciej.sosnowski@intel.com>
Cc: dan.j.williams@intel.com, shannon.nelson@intel.com,
	linux-kernel@vger.kernel.org, net-dev@vger.kernel.org
Subject: Re: [PATCH 1/2] I/OAT: Add watchdog/reset functionality to ioatdma driver
Date: Mon, 14 Jul 2008 16:17:40 +0200	[thread overview]
Message-ID: <487B6004.6090801@inria.fr> (raw)
In-Reply-To: <20080714132349.26830.22215.stgit@linux.site>

Maciej Sosnowski wrote:
> Due to occasional DMA channel hangs observed for I/OAT versions 1.2 and 2.0
> a watchdog has been introduced to check every 2 seconds
> if all channels progress normally.
> If stuck channel is detected, driver resets it.
> The reset is done in two parts. The second part is scheduled 
> by the first one to reinitialize the channel after the restart.
>   

Is all this transparent to the caller? Are you reposting all copies to
the hardware after the reset? Or are we going to get some DMA_ERROR
return values ?

> Sleep time in self_test has been increased to 10ms
> since in some cases 1ms appeared not to be enough

Thanks Maciej, this helps a lot here.

Brice


  reply	other threads:[~2008-07-14 14:17 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-07-14 13:23 [PATCH 0/2] I/OAT: watchdog/reset and tcp_dma_copybreak Maciej Sosnowski
2008-07-14 13:24 ` [PATCH 1/2] I/OAT: Add watchdog/reset functionality to ioatdma driver Maciej Sosnowski
2008-07-14 14:17   ` Brice Goglin [this message]
2008-07-18 16:06     ` Sosnowski, Maciej
2008-07-18 18:16     ` Dan Williams
2008-07-18 21:51       ` Brice Goglin
2008-07-22 23:27         ` Dan Williams
2008-07-14 13:25 ` [PATCH 2/2] I/OAT: tcp_dma_copybreak default value dependant on I/OAT version Maciej Sosnowski
  -- strict thread matches above, loose matches on Subject: below --
2008-07-14 13:27 [PATCH 0/2] I/OAT: watchdog/reset and tcp_dma_copybreak Maciej Sosnowski
2008-07-14 13:28 ` [PATCH 1/2] I/OAT: Add watchdog/reset functionality to ioatdma driver Maciej Sosnowski
2008-07-11 11:36 [PATCH 0/2] I/OAT: watchdog/reset and tcp_dma_copybreak Maciej Sosnowski
2008-07-11 11:36 ` [PATCH 1/2] I/OAT: Add watchdog/reset functionality to ioatdma driver Maciej Sosnowski
2008-07-11 20:07   ` Dan Williams
2008-07-18 15:53     ` Sosnowski, Maciej

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