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Message-ID: <4AB25A20.3040103@kernel.org> Date: Fri, 18 Sep 2009 00:47:44 +0900 From: Tejun Heo <tj@...nel.org> To: Mark Lord <liml@....ca> CC: Chris Webb <chris@...chsys.com>, Ric Wheeler <rwheeler@...hat.com>, Andrei Tanas <andrei@...as.ca>, NeilBrown <neilb@...e.de>, linux-kernel@...r.kernel.org, IDE/ATA development list <linux-ide@...r.kernel.org>, linux-scsi@...r.kernel.org, Jeff Garzik <jgarzik@...hat.com>, Mark Lord <mlord@...ox.com> Subject: Re: MD/RAID time out writing superblock Hello, Mark Lord wrote: >> That's interesting. One important side effect of issuing IDENTIFY is >> that they will serialize command streams as they are not NCQ commands >> and thus could change command patterns significantly. > .. > > SMART is the opcode that is most frequently implicated here, not IDENTIFY. Yeap, any non-NCQ commands would do it. > Note that even a barrier FLUSH CACHE is non NCQ and will serialize > the stream. Yeah, I was just thinking that issuing non-NCQ commands mixed with NCQ commands would make the command stream fluctuate more. Modern drives are pretty good at lowering power consumption while idle so being more fluctuative (is it a word?) might have something to do with the problem. Just a wild speculation tho. Thanks. -- tejun -- 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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