linux-kernel - Re: [PATCH v4 01/11] block: make generic_make

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Message-ID: <20150529151534.GA27800@redhat.com>
Date:	Fri, 29 May 2015 11:15:35 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	Ming Lin <mlin@...nel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>,
	Kent Overstreet <kent.overstreet@...il.com>,
	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>
Subject: Re: [PATCH v4 01/11] block: make generic_make_request handle
 arbitrarily sized bios

On Fri, May 29 2015 at  3:05P -0400,
Ming Lin <mlin@...nel.org> wrote:

> On Wed, May 27, 2015 at 5:36 PM, Alasdair G Kergon <agk@...hat.com> wrote:
> > On Wed, May 27, 2015 at 04:42:44PM -0700, Ming Lin wrote:
> >> Here are fio results of XFS on a DM stripped target with 2 SSDs + 1 HDD.
> >> Does it make sense?
> >
> > To stripe across devices with different characteristics?
> >
> > Some suggestions.
> >
> > Prepare 3 kernels.
> >   O - Old kernel.
> >   M - Old kernel with merge_bvec_fn disabled.
> 
> How to disable it?
> Maybe just hack it as below?
> 
> void blk_queue_merge_bvec(struct request_queue *q, merge_bvec_fn *mbfn)
> {
>         //q->merge_bvec_fn = mbfn;
> }

Right, there isn't an existing way to disable it, you'd need a hack like
that.
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