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


From: Eric Blake
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH] docs: document how to use the l2-cache-entry-size parameter
Date: Mon, 19 Feb 2018 10:44:23 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

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?

Otherwise,
Reviewed-by: Eric Blake <address@hidden>

--
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org



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