[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-discuss] SSD tuning
|
From: |
Alberto Garcia |
|
Subject: |
Re: [Qemu-discuss] SSD tuning |
|
Date: |
Thu, 11 Aug 2016 15:34:33 +0200 |
|
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Mon, Aug 08, 2016 at 04:12:06PM +0000, Tim Bell wrote:
> Any suggestions for how to tune KVM for SSDs on the hypervisor ?
> We’re seeing a significant drop (50%) of IOPS for random write
> from guest to host.
If you're using qcow2, you are doing random I/O and you have a
sufficiently big virtual disk, chances are you need to increase the
cache size:
Take a look at this:
https://blogs.igalia.com/berto/2015/12/17/improving-disk-io-performance-in-qemu-2-5-with-the-qcow2-l2-cache/
Berto