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Date: Tue, 30 Jan 2007 20:41:42 -0500 From: Mark Lord <liml@....ca> To: "Eric D. Mudama" <edmudama@...il.com> Cc: James Bottomley <James.Bottomley@...senpartnership.com>, linux-kernel@...r.kernel.org, IDE/ATA development list <linux-ide@...r.kernel.org>, linux-scsi <linux-scsi@...r.kernel.org> Subject: Re: [PATCH] scsi_lib.c: continue after MEDIUM_ERROR Eric D. Mudama wrote: > > Actually, it's possibly worse, since each failure in libata will > generate 3-4 retries. With existing ATA error recovery in the drives, > that's about 3 seconds per retry on average, or 12 seconds per failure. > Multiply that by the number of blocks past the error to complete the > request.. It really beats the alternative of a forced reboot due to, say, superblock I/O failing because it happened to get merged with an unrelated I/O which then failed.. Etc.. Definitely an improvement. The number of retries is an entirely separate issue. If we really care about it, then we should fix SD_MAX_RETRIES. The current value of 5 is *way* too high. It should be zero or one. Cheers - 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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