linux-kernel - Re: [PATCH v5 01/11] block: make generic_make

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Message-ID: <20150807073059.GB17485@lst.de>
Date:	Fri, 7 Aug 2015 09:30:59 +0200
From:	Christoph Hellwig <hch@....de>
To:	Kent Overstreet <kent.overstreet@...il.com>
Cc:	Christoph Hellwig <hch@....de>, Ming Lin <mlin@...nel.org>,
	Mike Snitzer <snitzer@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Jens Axboe <axboe@...nel.dk>, Dongsu Park <dpark@...teo.net>,
	Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Ming Lei <ming.lei@...onical.com>, Neil Brown <neilb@...e.de>,
	Alasdair Kergon <agk@...hat.com>, dm-devel@...hat.com,
	Lars Ellenberg <drbd-dev@...ts.linbit.com>,
	drbd-user@...ts.linbit.com, Jiri Kosina <jkosina@...e.cz>,
	Geoff Levand <geoff@...radead.org>, Jim Paris <jim@...n.com>,
	Joshua Morris <josh.h.morris@...ibm.com>,
	Philip Kelleher <pjk1939@...ux.vnet.ibm.com>,
	Minchan Kim <minchan@...nel.org>,
	Nitin Gupta <ngupta@...are.org>,
	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>,
	Ming Lin <ming.l@....samsung.com>
Subject: Re: [PATCH v5 01/11] block: make generic_make_request handle
	arbitrarily sized bios

On Thu, Aug 06, 2015 at 05:00:04PM -0700, Kent Overstreet wrote:
> Why is it that we don't want to send giant discards? Is it a latency issue?

Yes.  Take a look at the "Configurable max discard size" thread(s).
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