From: Roman Mamedov <rm@romanrm.net>
To: "Rainer Fügenstein" <rfu@oudeis.org>
Cc: Neil Brown <nfbrown@novell.com>, Linux-RAID <linux-raid@vger.kernel.org>
Subject: Re: performance issue (was: Re: kernel: BUG: soft lockup - CPU#1 stuck for 60s!)
Date: Sat, 24 Oct 2015 21:31:39 +0500 [thread overview]
Message-ID: <20151024213139.5b20dec6@natsu> (raw)
In-Reply-To: <43246687.20151024181541@oudeis.org>
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On Sat, 24 Oct 2015 18:15:41 +0200
Rainer Fügenstein <rfu@oudeis.org> wrote:
> hi,
>
> > I strongly recommend adding a write-intend bitmap
> > mdadm --grow /dev/md0 --bitmap=internal
>
> I did as suggested, but now it feels like performance has dropped to
> about 1/4th of what it used to be before. since this system is already
> pretty slow by design, this is quite frustrating.
Use a higher bitmap-chunk size, such as 256M or more.
--
With respect,
Roman
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next prev parent reply other threads:[~2015-10-24 16:31 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-15 13:38 kernel: BUG: soft lockup - CPU#1 stuck for 60s! [md0_raid5:1614] Rainer Fügenstein
2015-10-16 1:15 ` Neil Brown
2015-10-16 19:31 ` Rainer Fügenstein
2015-10-24 16:15 ` performance issue (was: Re: kernel: BUG: soft lockup - CPU#1 stuck for 60s!) Rainer Fügenstein
2015-10-24 16:31 ` Roman Mamedov [this message]
2015-10-25 19:23 ` Rainer Fügenstein
2015-10-25 20:08 ` Neil Brown
2015-10-25 20:32 ` Rainer Fügenstein
2015-10-25 21:10 ` Neil Brown
2015-11-02 22:55 ` performance issue Rainer Fügenstein
2015-11-03 1:34 ` Neil Brown
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