From: Marc Ballarin <Ballarin.Marc@gmx.de>
To: "Günter Merz" <lotan_rm@hotmail.com>
Cc: dm-crypt@saout.de
Subject: Re: [dm-crypt] md + dm-crypt + lvm2: I/O slows down system, I/O schedule ineffective
Date: Thu, 23 Feb 2012 11:57:27 +0100 [thread overview]
Message-ID: <4F461B97.7020000@gmx.de> (raw)
In-Reply-To: <BAY171-W21218AF052228CC456EBB7F7650@phx.gbl>
Hi,
Am 23.02.2012 11:19, schrieb Günter Merz:
> I'm experiencing unresponsiveness and a general system slowdown when I'm unpacking big archives or building a big packages (during builds I'm only using max 2 cores). To counter this, I've been experimenting with nice and ionice. Unfortunately, ionice -c3 before big I/O traffic doesn't seem to make any difference. The responsiveness is still really bad at times.
This sounds like those (more or less) well-known hugepage issues.
You could try "echo madvise >
/sys/kernel/mm/transparent_hugepage/defrag" (or "echo never...") if your
kernel is configured to use transparent hugepages (which most modern
distribution kernels are).
If this is your issue, the bug isn't really caused by dm-crypt, but by
Linux memory management issues and it is completely unrelated to ionice
or io scheduler settings.
Regards,
Marc
next prev parent reply other threads:[~2012-02-23 10:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-23 10:19 [dm-crypt] md + dm-crypt + lvm2: I/O slows down system, I/O schedule ineffective Günter Merz
2012-02-23 10:57 ` Marc Ballarin [this message]
2012-02-23 11:54 ` Alasdair G Kergon
2012-02-23 12:23 ` Milan Broz
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