Re: [Qemu-block] [PATCH] qcow2: Optimize L2 table cache size based on image and cluster sizes

[Alberto Garcia]

On Tue 04 Oct 2016 03:39:52 PM CEST, Ed Swierk wrote:

> This change replaces the hardcoded default L2 table cache size with a
> value computed from the image size and cluster size. The resulting
> default cache size is just large enough to service random accesses in
> the entire image.

That might be a lot of memory if the image is big. 1 TB qcow2 image ==
128 MB L2 cache.

See https://bugzilla.redhat.com/show_bug.cgi?id=1377735#c2

If we want to add this feature, I think I'd rather make it explicit.

Berto