From: Adrian Hunter <adrian.hunter@nokia.com>
To: Andreas Dilger <adilger@sun.com>
Cc: "Andrew.Morton.akpm@linux-foundation.org"
<Andrew.Morton.akpm@linux-foundation.org>,
"Andreas.Dilger.adilger@sun.com" <Andreas.Dilger.adilger@sun.com>,
"Stephen.Tweedie.sct@redhat.com" <Stephen.Tweedie.sct@redhat.com>,
"Bityutskiy Artem (Nokia-D/Helsinki)"
<Artem.Bityutskiy@nokia.com>,
"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
Subject: Re: [PATCH 2/2] HACK: do I/O read requests while ext3 journal recovers
Date: Wed, 15 Jul 2009 18:35:41 +0300 [thread overview]
Message-ID: <4A5DF74D.7010100@nokia.com> (raw)
In-Reply-To: <20090714212625.GE4829@webber.adilger.int>
Andreas Dilger wrote:
> On Jul 14, 2009 17:03 +0300, Adrian Hunter wrote:
>> The ext3 journal can take a long time to recover at mount
>> time. That was partially fixed by placing a barrier into
>> the I/O queue and then not waiting for the actual I/O to
>> complete.
>
> Note that you can also reduce the journal recovery time by
> reducing the size of the journal. Having a large journal
> is needed for getting good performance with lots of updates
> at high speeds. If you aren't doing a large amount of
> filesystem IO (which I'd guess for an embedded device, assuming
> you are using it for that), then you could reduce the size of
> the journal to the minimum (1000 blocks) and this will also
> reduce the recovery time correspondingly.
Yes that may help, although the number of blocks involved is
fairly small.
next prev parent reply other threads:[~2009-07-15 15:36 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-14 14:02 [PATCH 0/2] ext3 HACKs Adrian Hunter
2009-07-14 14:03 ` [PATCH 1/2] HACK: ext3: mount fast even when recovering Adrian Hunter
2009-07-14 21:22 ` Andreas Dilger
2009-07-15 15:35 ` Adrian Hunter
2009-07-14 14:03 ` [PATCH 2/2] HACK: do I/O read requests while ext3 journal recovers Adrian Hunter
2009-07-14 21:26 ` Andreas Dilger
2009-07-15 15:35 ` Adrian Hunter [this message]
2009-07-14 15:51 ` [PATCH 0/2] ext3 HACKs Theodore Tso
-- strict thread matches above, loose matches on Subject: below --
2009-07-14 14:05 Adrian Hunter
2009-07-14 14:06 ` [PATCH 2/2] HACK: do I/O read requests while ext3 journal recovers Adrian Hunter
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