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Re: [Qemu-block] [Qemu-devel] [PATCH] docs: document how to use the l2-c

From: Alberto Garcia
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH] docs: document how to use the l2-cache-entry-size parameter
Date: Mon, 19 Feb 2018 19:26:51 +0100
User-agent: Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu)

On Mon 19 Feb 2018 05:44:23 PM CET, Eric Blake <address@hidden> wrote:
> On 02/19/2018 08:54 AM, Alberto Garcia wrote:
>> This patch updates docs/qcow2-cache.txt explaining how to use the new
>> l2-cache-entry-size parameter.
>> Here's a more detailed technical description of this feature:
>>     https://lists.gnu.org/archive/html/qemu-block/2017-09/msg00635.html
>> And here are some performance numbers:
>>     https://lists.gnu.org/archive/html/qemu-block/2017-12/msg00507.html
>> Signed-off-by: Alberto Garcia <address@hidden>
>> ---
>>   docs/qcow2-cache.txt | 46 +++++++++++++++++++++++++++++++++++++++++++---
>>   1 file changed, 43 insertions(+), 3 deletions(-)
>> +Some things to take into account:
>> +
>> + - The L2 cache entry size has the same restrictions as the cluster
>> +   size (power of two, at least 512 bytes).
> Worth mentioning the upper limit of the cluster size?

I thought it would be unnecessary since the that's already mentioned
several times in the text ("you can change the size [...] and make it
smaller than the cluster size", "Using smaller cache entries"), and I
think it's pretty obvious if you actually read that section.


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