From: Milan Broz <mbroz@redhat.com>
To: dave b <db.pub.mail@gmail.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
device-mapper development <dm-devel@redhat.com>
Subject: Re: Fwd: [dm-crypt] [BUG] bad performance and system stalls when using dm-crypt
Date: Sun, 24 Oct 2010 18:31:18 +0200 [thread overview]
Message-ID: <4CC45F56.7010305@redhat.com> (raw)
In-Reply-To: <AANLkTikqhMbW7sWbbU_we5YE9Y9U=MPUTm553AmCyH51@mail.gmail.com>
On 10/24/2010 05:32 PM, dave b wrote:
> I am forwarding this to the linux kernel mailing list to see if anyone
> is actually interested with this bug or not. I suspect that the patch
> to allow DM-CRYPT to use multiple cpus(Scale to multiple CPUs) will
> remove most of the problem but *not* all of it. As I previously was
> triggering the bug on a single core system.
Hi,
sorry for not updating the bug. We know about this.
Fix was expected to be based on top of the Andi's dm-crypt per-cpu
patch but unfortunately I found serious problems there
(see this thread http://lkml.org/lkml/2010/10/20/215 )
So there are now several known situations when dm-crypt doesn't
perform as expected (another problem just appeared when using CFQ,
(because dm(-crypt) lost the issuing process reference)
see http://lkml.org/lkml/2010/10/24/59).
Milan
next parent reply other threads:[~2010-10-24 16:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <AANLkTinbeAn4ObFSb4f4znjYHGNKTMnfV7eQja+cnsLe@mail.gmail.com>
[not found] ` <20100911065725.GA6279@fancy-poultry.org>
[not found] ` <AANLkTikTq=GTy-XPD6ye6kStASNL4Pa07wHhH_ABmpm1@mail.gmail.com>
[not found] ` <AANLkTim7RvpOcBajyqCkrBP8EW-FwNysvwuF5MaDJiFV@mail.gmail.com>
[not found] ` <AANLkTi=PCd1=w-mkc=Sj4EEda=PnTv0JGyV1Ysxq4ej4@mail.gmail.com>
[not found] ` <AANLkTikLSFFpbgX+rBR5banBygmB6rRvzMBYKfPcFPuJ@mail.gmail.com>
[not found] ` <4C8C9834.8060201@redhat.com>
[not found] ` <AANLkTi=8jJMz3f0VGwg+6P+BJEfxj6i-jBkGmqx8hCVg@mail.gmail.com>
[not found] ` <AANLkTinohRReVsYoetEjqAp-XrL9C2jxGgXLVnLafSUM@mail.gmail.com>
[not found] ` <AANLkTikqhMbW7sWbbU_we5YE9Y9U=MPUTm553AmCyH51@mail.gmail.com>
2010-10-24 16:31 ` Milan Broz [this message]
2010-10-24 16:52 ` Fwd: [dm-crypt] [BUG] bad performance and system stalls when using dm-crypt dave b
2010-10-24 17:05 ` Milan Broz
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