Date: Tue, 16 Mar 2010 19:00:52 +0100
From: martin f krafft <madduck@madduck.net>
To: "Aneesh Kumar K. V" <aneesh.kumar@linux.vnet.ibm.com>
Message-ID: <20100316180052.GA6600@piper.oerlikon.madduck.net>
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	Ben Gamari <bgamari.foss@gmail.com>, Olly Betts <olly@survex.com>,
	notmuch@notmuchmail.org
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Cc: Olly Betts <olly@survex.com>, notmuch@notmuchmail.org
Subject: Re: [notmuch] Notmuch performance (literally, in my case)
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also sprach Aneesh Kumar K. V <aneesh.kumar@linux.vnet.ibm.com> [2010.03.16=
=2E1810 +0100]:
> Ext3 fsync related issue is a know problem due to the way journalling is
> handled in ext3. The solution for that would be data=3Dwriteback ( with
> its loss of data integrity ) or not yet upstreamed data=3Dguarded. Another
> option would be to try ext4 which should not be impacted that badly by
> the data=3Dordered journalled mode

I use ext4 with data=3Dordered, and while notmuch is writing the
Xapian database, most I/O stalls on the machine:

  - Firefox does not get any mouse events
  - Vim blocks writing the viminfo file
  - All disk operations queue for multiple seconds.

So no, ext4 is not a solution. Is it just me, or should no
filesystem of this world be able to hog a system this badly? I think
the culprit is the IO-scheduler.

--=20
martin | http://madduck.net/ | http://two.sentenc.es/
=20
"vulgarity is simply the conduct of other people."
                                                        -- oscar wilde
=20
spamtraps: madduck.bogus@madduck.net

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