From: Neil Brown <neilb@suse.de>
To: Shaohua Li <shli@fb.com>
Cc: Christoph Hellwig <hch@lst.de>,
"linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>,
Kernel Team <Kernel-team@fb.com>,
"dan.j.williams@intel.com" <dan.j.williams@intel.com>
Subject: Re: raid5-cache I/O path improvements V2
Date: Wed, 30 Sep 2015 15:39:52 +1000 [thread overview]
Message-ID: <87vbaslb2v.fsf@notabene.neil.brown.name> (raw)
In-Reply-To: <20150928140127.GA30927@lst.de>
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Christoph Hellwig <hch@lst.de> writes:
> So the summary is that for now you want me to resend with a patch
> to opt into using FUA?
I'd like to avoid "opt in" if at all possible.
Shoahua measured that using "FUA" for all writes to the journal
hurt performance on at least one device. Do you have a different device
where it demonstrably helps?
If there any chance of automatically detecting which is which?
>
> Also do you have a git tree as a baseline somewhere? I've been collecting
> the patches you've sent, but with increasing time I fear I might have
> missed something.
(almost) all at git://neil.brown.name/md in 'devel' branch.
Thanks,
NeilBrown
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next prev parent reply other threads:[~2015-09-30 5:39 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-12 6:17 raid5-cache I/O path improvements V2 Christoph Hellwig
2015-09-12 6:17 ` [PATCH 01/12] raid5-cache: port to 4.3-rc Christoph Hellwig
2015-09-12 6:17 ` [PATCH 02/12] raid5-cache: free I/O units earlier Christoph Hellwig
2015-09-15 7:00 ` Neil Brown
2015-09-17 1:50 ` Christoph Hellwig
2015-09-15 8:07 ` Neil Brown
2015-09-17 1:48 ` Christoph Hellwig
2015-09-12 6:17 ` [PATCH 03/12] raid5-cache: rename flushed_ios to finished_ios Christoph Hellwig
2015-09-12 6:17 ` [PATCH 04/12] raid5-cache: factor out a helper to run all stripes for an I/O unit Christoph Hellwig
2015-09-12 6:17 ` [PATCH 05/12] raid5-cache: use FUA writes for the log Christoph Hellwig
2015-09-12 6:17 ` [PATCH 06/12] raid5-cache: clean up r5l_get_meta Christoph Hellwig
2015-09-12 6:17 ` [PATCH 07/12] raid5-cache: refactor bio allocation Christoph Hellwig
2015-09-12 6:17 ` [PATCH 08/12] raid5-cache: take rdev->data_offset into account early on Christoph Hellwig
2015-09-12 6:17 ` [PATCH 09/12] raid5-cache: inline r5l_alloc_io_unit into r5l_new_meta Christoph Hellwig
2015-09-12 6:17 ` [PATCH 10/12] raid5-cache: new helper: r5_reserve_log_entry Christoph Hellwig
2015-09-12 6:17 ` [PATCH 11/12] raid5-cache: small log->seq cleanup Christoph Hellwig
2015-09-12 6:17 ` [PATCH 12/12] raid5-cache: use bio chaining Christoph Hellwig
2015-09-14 19:11 ` raid5-cache I/O path improvements V2 Shaohua Li
2015-09-15 7:23 ` Neil Brown
2015-09-15 21:54 ` Shaohua Li
2015-09-17 1:53 ` Christoph Hellwig
2015-09-28 14:01 ` Christoph Hellwig
2015-09-30 5:39 ` Neil Brown [this message]
2015-09-30 15:00 ` Christoph Hellwig
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