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Date: Fri, 18 Jul 2008 17:06:06 +0100 From: "Sosnowski, Maciej" <maciej.sosnowski@...el.com> To: "Brice Goglin" <Brice.Goglin@...ia.fr> Cc: "Williams, Dan J" <dan.j.williams@...el.com>, "Nelson, Shannon" <shannon.nelson@...el.com>, <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org> Subject: RE: [PATCH 1/2] I/OAT: Add watchdog/reset functionality to ioatdma driver Brice Goglin wrote: > 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 ? Yes, it is transparent. The driver should take care of all the descriptors that have not been served before the reset. >> 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. Sure. > > Brice Regards, Maciej -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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