linux-ext4 - [Bug 20902] High IO wait when writing to ext4

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Message-Id: <201010292113.o9TLDsI0020719@demeter1.kernel.org>
Date:	Fri, 29 Oct 2010 21:13:54 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 20902] High IO wait when writing to ext4

https://bugzilla.kernel.org/show_bug.cgi?id=20902

Theodore Tso <tytso@....edu> changed:

           What    |Removed                     |Added
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                 CC|                            |tytso@....edu

--- Comment #11 from Theodore Tso <tytso@....edu>  2010-10-29 21:13:50 ---
Did things work OK with an earlier kernel version?   Is this something that has
always troubled you, or is it something which recently started when you
upgraded to the 2.6.36 kernel?

Once things are OK after "the first write", are they OK forever after that?  If
the problem re-occurs after the first write, can you say something about when
that might be?

How about replicating it on a USB attached disk?  Can you try a couple of
different scenarios with a USB attached disk?  Say,

1) With a USB attached disk using a MBR-partitioned disk?
2) With a USB attached disk set up using LVM with a single LVM volume?
3) With a USB attached disk set up using LVM and a LUKS-encrypted volume?

etc.

And can you specified what mount options, if any, that you were using?

Thanks,

-- Ted

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