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Re: [Qemu-devel] [PATCH v3 4/5] qcow2: Set the default cache-clean-inter

From: Alberto Garcia
Subject: Re: [Qemu-devel] [PATCH v3 4/5] qcow2: Set the default cache-clean-interval to 30 seconds
Date: Wed, 08 Aug 2018 13:57:26 +0200
User-agent: Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu)

On Wed 08 Aug 2018 01:49:08 PM CEST, Leonid Bloch wrote:
> On 08/08/2018 02:47 PM, Alberto Garcia wrote:
>> On Wed 08 Aug 2018 09:10:50 AM CEST, Leonid Bloch wrote:
>>> The default cache-clean-interval is set to 30 seconds, in order to lower
>>> the overhead of the qcow2 caches (before the default was 0, i.e.
>>> disabled).
>>> Signed-off-by: Leonid Bloch <address@hidden>
>> Reviewed-by: Alberto Garcia <address@hidden>
>>> +#define DEFAULT_CACHE_CLEAN_INTERVAL 30  /* seconds */
>> I wonder if it shouldn't be a bit higher, though. Isn't 30 seconds too
>> low for a default?
> I also had this thought. What would you suggest?

I don't know, 5 minutes at least. It should discard cache entries that
haven't been used in a while.

It my opinion the default should be for saving memory in VMs that are
mostly idle. If the VM is more or less active I wouldn't want to clean
cache entries that are used frequently.


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