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Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format
From: |
Alex Bligh |
Subject: |
Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format |
Date: |
Wed, 14 Aug 2013 16:02:36 +0100 |
On 14 Aug 2013, at 15:26, Kaveh Razavi wrote:
> This is a good idea, since it relaxes the requirement for releasing the
> cache only on shutdown. I am not sure how the 'finish point' can be
> recognized. Full cache quota is one obvious scenario, but I imagine most
> VMs do/should not really read till that point (unless they are doing
> something that should not be cached anyway - e.g. file-system check).
> Another possibility is registering some sort of event to be executed
> periodically (e.g. every 30 seconds), and if the cache is not modified
> in a period, then that is the 'finish point'. I do not know how feasible
> that is with the facilities that qemu provides.
You can set timers and modify them - that's easy enough. I suspect the
heuristic may need some tuning, but a simple one such as '60 seconds
after boot' might be sufficient. After all, if a VM takes more than
60 seconds to boot and does not fill the cache quota in that time,
I think we can assume the cache isn't going to do it much good!
--
Alex Bligh
Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format, Alex Bligh, 2013/08/13
- Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format, Kaveh Razavi, 2013/08/14
- Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format, Alex Bligh, 2013/08/14
- Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format, Kaveh Razavi, 2013/08/14
- Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format, Alex Bligh, 2013/08/14
- Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format, Kaveh Razavi, 2013/08/14
- Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format,
Alex Bligh <=
- Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format, Kevin Wolf, 2013/08/14
- Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format, Wenchao Xia, 2013/08/15
- Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format, Stefan Hajnoczi, 2013/08/15
Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format, Stefan Hajnoczi, 2013/08/14