[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH v5 0/2] block: enforce minimal 4096 alignment in
|
From: |
Paolo Bonzini |
|
Subject: |
Re: [Qemu-devel] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign |
|
Date: |
Mon, 01 Jun 2015 12:41:00 +0200 |
|
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
On 01/06/2015 12:34, Dmitry Monakhov wrote:
> Yes. Improvement is not huge, but it can be detected for old qemu
> unpatched kernel: 728 MiB/sec ± 20Mb patched kernel : 748 MiB/sec
> ± 10Mb
Ok, so about 3-4%. What does the blktrace look like with a patched
kernel, and what is the performance with old QEMU?
Paolo
> IMHO patch is not sufficient. We have to correct bio construction
> inside direct-io code. I'll be back with the patch.