From: Paolo Bonzini <pbonzini@redhat.com>
To: Peter Lieven <pl@kamp.de>
Cc: kwolf@redhat.com, ronniesahlberg@gmail.com,
qemu-devel@nongnu.org, stefanha@redhat.com, mreitz@redhat.com
Subject: Re: [Qemu-devel] [PATCH 4/4] block: avoid creating oversized writes in multiwrite_merge
Date: Fri, 19 Sep 2014 15:33:09 +0200 [thread overview]
Message-ID: <541C3095.4040405@redhat.com> (raw)
In-Reply-To: <B9522E44-7F3C-4954-8F53-A4DC214F408F@kamp.de>
Il 19/09/2014 00:56, Peter Lieven ha scritto:
>> > So I think if we treat it just as a hint for multiwrite, we can avoid
>> > writing code to split oversized requests. They always worked so far, we
>> > can certainly wait until we have a real bug fix.
> I would not treat this as a hint. I would use it in cases where we definitely
> know an absolute hard limit for I/O request size. Otherwise the value for
> bs->bl.max_transfer_length should be 0.
>
> If there comes in an oversized request we fail it as early as possible
That's the part that I'd rather not touch, at least not without doing
request splitting.
Paolo
and regarding
> the multi write code we avoid that it accidentally generates an oversized request.
next prev parent reply other threads:[~2014-09-19 13:33 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-05 16:51 [Qemu-devel] [PATCH 0/4] introduce max_transfer_length Peter Lieven
2014-09-05 16:51 ` [Qemu-devel] [PATCH 1/4] BlockLimits: " Peter Lieven
2014-09-05 16:51 ` [Qemu-devel] [PATCH 2/4] block: immediately cancel oversized read/write requests Peter Lieven
2014-09-08 13:44 ` Benoît Canet
2014-09-08 13:49 ` Paolo Bonzini
2014-09-08 13:56 ` Peter Lieven
2014-09-08 13:58 ` Paolo Bonzini
2014-09-08 14:35 ` Peter Lieven
2014-09-08 14:42 ` Paolo Bonzini
2014-09-08 14:54 ` Peter Lieven
2014-09-23 8:47 ` Kevin Wolf
2014-09-23 8:55 ` Peter Lieven
2014-09-23 9:09 ` Kevin Wolf
2014-09-08 15:13 ` ronnie sahlberg
2014-09-08 15:15 ` Paolo Bonzini
2014-09-08 15:18 ` Peter Lieven
2014-09-08 15:27 ` Paolo Bonzini
2014-09-08 16:18 ` Peter Lieven
2014-09-08 16:29 ` Paolo Bonzini
2014-09-12 11:43 ` Peter Lieven
2014-09-18 14:12 ` Paolo Bonzini
2014-09-18 14:16 ` Peter Lieven
2014-09-18 14:17 ` Paolo Bonzini
2014-09-18 22:57 ` Peter Lieven
2014-09-08 15:16 ` Peter Lieven
2014-09-05 16:51 ` [Qemu-devel] [PATCH 3/4] block/iscsi: set max_transfer_length Peter Lieven
2014-09-05 16:51 ` [Qemu-devel] [PATCH 4/4] block: avoid creating oversized writes in multiwrite_merge Peter Lieven
2014-09-18 14:13 ` Paolo Bonzini
2014-09-18 22:56 ` Peter Lieven
2014-09-19 13:33 ` Paolo Bonzini [this message]
2014-09-22 9:43 ` Peter Lieven
2014-09-22 19:06 ` Paolo Bonzini
2014-09-23 6:15 ` Peter Lieven
2014-09-23 8:59 ` Kevin Wolf
2014-09-23 9:04 ` Peter Lieven
2014-09-23 9:32 ` Peter Lieven
2014-09-23 9:47 ` Kevin Wolf
2014-09-23 9:52 ` Peter Lieven
2014-09-23 10:05 ` Kevin Wolf
2014-09-30 7:26 ` Peter Lieven
2014-09-30 8:03 ` Kevin Wolf
2014-09-05 17:05 ` [Qemu-devel] [PATCH 0/4] introduce max_transfer_length ronnie sahlberg
2014-09-05 19:52 ` Peter Lieven
2014-09-05 21:22 ` ronnie sahlberg
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