From: Markus Suvanto <markus.suvanto@gmail.com>
To: diegocg@gmail.com
Cc: linux-btrfs@vger.kernel.org
Subject: Poor performance with qemu
Date: Mon, 29 Mar 2010 22:21:20 +0300 [thread overview]
Message-ID: <bcf98daa1003291221h9ab2e05xe877ffc083e45266@mail.gmail.com> (raw)
>Hi, I'm using KVM, and the virtual disk (a 20 GB file using the "raw"
>qemu format according to virt-manager and, of course, placed on a btrfs
>filesystem, running the latest mainline git) is awfully slow, no matter
>what OS is running inside the VM. The PCBSD installer says it's copying
>data at a 40-50 KB/s rate. Is someone using KVM and having better numbers
>than me? How can I help to debug this workload?
Maybe cache=writeback helps?
-drive file=image.raw,cache=writeback
-Markus
next reply other threads:[~2010-03-29 19:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-29 19:21 Markus Suvanto [this message]
-- strict thread matches above, loose matches on Subject: below --
2010-03-28 15:18 Poor performance with qemu Diego Calleja
2010-03-30 12:56 ` Chris Mason
2010-04-08 14:58 ` Avi Kivity
2010-04-08 15:21 ` Gordan Bobic
2010-04-08 15:26 ` Chris Mason
2010-04-08 15:28 ` Avi Kivity
2010-04-08 15:32 ` Chris Mason
2010-04-08 15:34 ` Christoph Hellwig
2010-04-08 15:36 ` Avi Kivity
2010-04-08 15:39 ` Christoph Hellwig
2010-04-08 15:32 ` Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=bcf98daa1003291221h9ab2e05xe877ffc083e45266@mail.gmail.com \
--to=markus.suvanto@gmail.com \
--cc=diegocg@gmail.com \
--cc=linux-btrfs@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).