This series makes the qcow2 L2 cache cover the entire image by default. 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 30 seconds by default (was disabled by default before). The L2 cache is also resized accordingly, by default, if the image is resized. Additionally, few minor changes are made (refactoring and documentation fixes). Differences from v1: * .gitignore modification patch removed (unneeded). * The grammar fix in conflicting cache sizing patch removed (merged). * The update total_sectors when resizing patch squashed with the resizing patch. * L2 cache is now capped at 32 MB. * The default cache-clean-interval is set to 30 seconds. Differences from v2: * Made it clear in the documentation that setting cache-clean-interval to 0 disables this feature. Leonid Bloch (5): qcow2: Options' documentation fixes qcow2: Make the default L2 cache sufficient to cover the entire image qcow2: Resize the cache upon image resizing qcow2: Set the default cache-clean-interval to 30 seconds qcow2: Explicit number replaced by a constant block/qcow2.c | 47 +++++++++++++++++++------------------- block/qcow2.h | 5 ++-- docs/qcow2-cache.txt | 31 +++++++++++++++---------- qapi/block-core.json | 3 ++- qemu-options.hx | 11 +++++---- tests/qemu-iotests/137 | 1 - tests/qemu-iotests/137.out | 1 - 7 files changed, 54 insertions(+), 45 deletions(-) -- 2.17.1
