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Message-ID: <4D8A1133.20502@fusionio.com> Date: Wed, 23 Mar 2011 16:26:43 +0100 From: Jens Axboe <jaxboe@...ionio.com> To: Christoph Hellwig <hch@...radead.org> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: merging discard request in the block layer On 2011-03-23 14:01, Christoph Hellwig wrote: > On Tue, Mar 22, 2011 at 10:03:57PM +0100, Jens Axboe wrote: >>> That would seem to indicate a bug in the merging logic instead. >> >> What kind of max discard size does you device have? If the max discard >> size is smaller than the regular request size, this could help. > > It's a SCSI device, so the max discard size is a lot larger: > > # cat /sys/block/sda/queue/max_sectors_kb > 512 > # cat /sys/block/sda/queue/max_hw_sectors_kb > 32767 > # cat /sys/block/sda/queue/discard_max_bytes > 4294966784 I'll try and throw a synthetic test at it that produces a slew of discard merging and see what happens. -- Jens Axboe -- 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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