From: Mike Snitzer <snitzer@redhat.com>
To: Ming Lin <mlin@kernel.org>
Cc: Neil Brown <neilb@suse.de>, Ming Lei <ming.lei@canonical.com>,
dm-devel@redhat.com, Christoph Hellwig <hch@lst.de>,
Alasdair Kergon <agk@redhat.com>,
Lars Ellenberg <drbd-dev@lists.linbit.com>,
Philip Kelleher <pjk1939@linux.vnet.ibm.com>,
Joshua Morris <josh.h.morris@us.ibm.com>,
Christoph Hellwig <hch@infradead.org>,
Kent Overstreet <kent.overstreet@gmail.com>,
Nitin Gupta <ngupta@vflare.org>,
Oleg Drokin <oleg.drokin@intel.com>,
Al Viro <viro@zeniv.linux.org.uk>, Jens Axboe <axboe@kernel.dk>,
Andreas Dilger <andreas.dilger@intel.com>,
Geoff Levand <geoff@infradead.org>, Jiri Kosina <jkosina@suse.cz>,
lkml <linux-kernel@vger.kernel.org>, Jim Paris <jim@jtan.com>,
Minchan Kim <minchan@kernel.org>, Dongsu Park <dpark@posteo.net>,
drbd-user@lists.linbit.com
Subject: Re: [Drbd-dev] [PATCH v4 01/11] block: make generic_make_request handle arbitrarily sized bios
Date: Fri, 29 May 2015 11:15:35 -0400 [thread overview]
Message-ID: <20150529151534.GA27800@redhat.com> (raw)
In-Reply-To: <CAF1ivSY1w40wixbRZJq0dnT9K15uOMmMmAEUELLdrG5=owFsLA@mail.gmail.com>
On Fri, May 29 2015 at 3:05P -0400,
Ming Lin <mlin@kernel.org> wrote:
> On Wed, May 27, 2015 at 5:36 PM, Alasdair G Kergon <agk@redhat.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.
next prev parent reply other threads:[~2015-05-29 15:15 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1432318723-18829-1-git-send-email-mlin@kernel.org>
2015-05-22 18:18 ` [Drbd-dev] [PATCH v4 01/11] block: make generic_make_request handle arbitrarily sized bios Ming Lin
2015-05-25 5:46 ` NeilBrown
2015-05-26 14:36 ` Mike Snitzer
2015-05-26 15:02 ` Ming Lin
2015-05-26 15:34 ` Alasdair G Kergon
2015-05-26 23:06 ` NeilBrown
2015-05-27 0:40 ` [Drbd-dev] [dm-devel] " Alasdair G Kergon
2015-05-27 8:20 ` Christoph Hellwig
2015-05-26 16:04 ` [Drbd-dev] " Mike Snitzer
2015-05-26 17:17 ` Ming Lin
2015-05-27 23:42 ` Ming Lin
2015-05-28 0:36 ` Alasdair G Kergon
2015-05-28 5:54 ` Ming Lin
2015-05-29 7:05 ` Ming Lin
2015-05-29 15:15 ` Mike Snitzer [this message]
2015-06-01 6:02 ` Ming Lin
2015-06-02 20:59 ` Ming Lin
2015-06-04 21:06 ` Mike Snitzer
2015-06-04 22:21 ` Ming Lin
2015-06-05 0:06 ` Mike Snitzer
2015-06-05 5:21 ` Ming Lin
2015-06-09 6:09 ` Ming Lin
2015-06-10 21:20 ` Ming Lin
2015-06-10 21:46 ` Mike Snitzer
2015-06-10 22:06 ` Ming Lin
2015-06-12 5:49 ` Ming Lin
2015-06-18 5:27 ` Ming Lin
2015-05-22 18:18 ` [Drbd-dev] [PATCH v4 08/11] block: kill merge_bvec_fn() completely Ming Lin
2015-05-25 5:49 ` NeilBrown
2015-05-25 14:04 ` Christoph Hellwig
2015-05-25 15:02 ` Ilya Dryomov
2015-05-25 15:08 ` Christoph Hellwig
2015-05-25 15:19 ` Ilya Dryomov
2015-05-25 15:35 ` Alex Elder
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