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Message-ID: <1353007392.4447.22.camel@haakon2.linux-iscsi.org> Date: Thu, 15 Nov 2012 11:23:12 -0800 From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org> To: Christoph Hellwig <hch@...radead.org> Cc: target-devel <target-devel@...r.kernel.org>, linux-scsi <linux-scsi@...r.kernel.org>, linux-kernel <linux-kernel@...r.kernel.org>, Christoph Hellwig <hch@....de>, "Martin K. Petersen" <martin.petersen@...cle.com> Subject: Re: [PATCH 2/3] target: Add max_write_same_len device attribute On Thu, 2012-11-15 at 05:53 -0500, Christoph Hellwig wrote: > On Thu, Nov 08, 2012 at 08:07:17PM +0000, Nicholas A. Bellinger wrote: > > From: Nicholas Bellinger <nab@...ux-iscsi.org> > > > > This patch adds a new max_write_same_len device attribute for use with > > WRITE_SAME w/ UNMAP=0 backend emulation. > > > > Also, update block limits VPD emulation code in spc_emulate_evpd_b0() to > > set the default MAXIMUM WRITE SAME LENGTH value of zero. > > why do we need an exposed attribute for this? > This is useful for userspace to reduce the allowed maximum from the default 0xFFFF set by IBLOCK. Allowing huge WRITE_SAMEs can very much effect performance (esp. with spinning media), so being able to reduce the max we accept via a userspace tunable is helpful. --nab -- 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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