linux-ext4 - [Bug 18302] [BUG] bad performance and system stalls when using dm-crypt

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Date:	Sun, 24 Oct 2010 15:48:57 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 18302] [BUG] bad performance and system stalls when using
 dm-crypt

https://bugzilla.kernel.org/show_bug.cgi?id=18302





--- Comment #1 from david b <db.pub.mail@...il.com>  2010-10-24 15:48:56 ---
...
For example:
doing something stupid like this 

dd if=/dev/zero of=TEMP count=15553600 &
dd if=/dev/zero of=TEMP2 count=15553600 &
ls -lahR / &
will --> end up with the following output :/

fsync time: 25.8393
pread time: 0.0010
fsync time: 20.6251
pread time: 0.0007
fsync time: 31.0960
pread time: 5.3767
fsync time: 28.0393
pread time: 16.1137
fsync time: 19.2237
pread time: 12.9312
fsync time: 25.0550
pread time: 6.7220
fsync time: 9.8830
pread time: 0.0009

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