Hi Leonid,
Am 13.08.2018 um 03:07 hat Leonid Bloch geschrieben:
This series makes the qcow2 L2 cache assignment aware of the image size,
with the intention for it to cover the entire image. The importance of
this change is in noticeable performance improvement, especially with
heavy random I/O. The memory overhead is not big in most cases, as only
1 MB of cache for every 8 GB of image size is used. For cases with very
large images and/or small cluster sizes, or systems with limited RAM
resources, there is an upper limit on the default L2 cache: 32 MB. To
modify this limit one can use the already existing 'l2-cache-size' and
'cache-size' options. Moreover, this fixes the behavior of 'l2-cache-size',
as it was documented as the *maximum* L2 cache size, but in practice
behaved as the absolute size.
To compensate the memory overhead which may be increased following this
behavior, the default cache-clean-interval is set to 10 minutes by default
(was disabled by default before).
The L2 cache is also resized accordingly, by default, if the image is
resized.
after digging through the most urgent part of my post-vacation backlog,
I saw this series again. It's been a while, but I don't think much is
missing, so let's get this finished now. :-)
We had some discussion in the v7 thread after you posted v8, and you
mentioned there that you'd do some changes in a v9 (at first sight, just
some test case stuff). Are you still planning to send that v9?
Kevin