From: Tomasz Chmielewski <mangoo-Nem3ZqsbT/g@public.gmane.org>
To: dm-crypt-4q3lyFh4P1g@public.gmane.org,
dm-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
Subject: SMP-aware kcryptd?
Date: Mon, 13 Apr 2009 15:41:33 +0200 [thread overview]
Message-ID: <49E3410D.9040500@wpkg.org> (raw)
Currently, the trend with CPUs is to add more cores rather than increase
the speed of a single core.
This does not scale very well with certain things in the Linux kernel.
One of them is kcryptd.
A system able to deliver data with a speed of ~200 MB/s from a RAID
array, will be only able to deliver a fraction of it (i.e. ~40 MB/s in
my case) when reads are being done from a dm-crypt device.
This is because kcryptd is not SMP-aware: it performs all calculations
on a single logical CPU only.
Are there any plans to change it?
--
Tomasz Chmielewski
http://wpkg.org
next reply other threads:[~2009-04-13 13:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-13 13:41 Tomasz Chmielewski [this message]
2009-04-13 17:36 ` SMP-aware kcryptd? Milan Broz
2009-04-13 17:47 ` Tomasz Chmielewski
2009-04-13 19:33 ` Larry Dickson
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