From: Christoph Hellwig <hch@lst.de>
To: Shaohua Li <shli@fb.com>
Cc: Neil Brown <neilb@suse.de>, 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: Thu, 17 Sep 2015 03:53:26 +0200 [thread overview]
Message-ID: <20150917015326.GA22865@lst.de> (raw)
In-Reply-To: <20150915215458.GA1943628@devbig084.prn1.facebook.com>
On Tue, Sep 15, 2015 at 02:54:59PM -0700, Shaohua Li wrote:
> > I don't want a sysfs config if we can possibly avoid it.
> >
> > Christoph's code sets FUA on every block written to the log, both data
> > and metadata. Is that really what we want?
> >
> > I don't know much of the hardware details, but wouldn't setting FUA and
> > FLUSH on the last block written be just as effective and possibly faster
> > (by giving more flexibility to lower layers)??
>
> How is it different against without FUA, eg, doing a flush after several bios?
It's just a more complicated version of doing the same..
next prev parent reply other threads:[~2015-09-17 1:53 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 [this message]
2015-09-28 14:01 ` Christoph Hellwig
2015-09-30 5:39 ` Neil Brown
2015-09-30 15:00 ` Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20150917015326.GA22865@lst.de \
--to=hch@lst.de \
--cc=Kernel-team@fb.com \
--cc=dan.j.williams@intel.com \
--cc=linux-raid@vger.kernel.org \
--cc=neilb@suse.de \
--cc=shli@fb.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.