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| author | Leonid Bloch <lbloch@janustech.com> | 2018-09-26 19:04:43 +0300 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2018-10-01 12:51:12 +0200 |
| commit | b749562d9822d14ef69c9eaa5f85903010b86c30 (patch) | |
| tree | c1b104511519217d7134b190eb0f89ee498c6eab /tests/qemu-iotests/137 | |
| parent | 657ada52abb85140e56949f522ecec527b256450 (diff) | |
| download | qemu-b749562d9822d14ef69c9eaa5f85903010b86c30.zip qemu-b749562d9822d14ef69c9eaa5f85903010b86c30.tar.gz qemu-b749562d9822d14ef69c9eaa5f85903010b86c30.tar.bz2 | |
qcow2: Assign the L2 cache relatively to the image size
Sufficient L2 cache can noticeably improve the performance when using
large images with frequent I/O.
Previously, unless 'cache-size' was specified and was large enough, the
L2 cache was set to a certain size without taking the virtual image size
into account.
Now, the L2 cache assignment is aware of the virtual size of the image,
and will cover the entire image, unless the cache size needed for that is
larger than a certain maximum. This maximum is set to 1 MB by default
(enough to cover an 8 GB image with the default cluster size) but can
be increased or decreased using the 'l2-cache-size' option. This option
was previously documented as the *maximum* L2 cache size, and this patch
makes it behave as such, instead of as a constant size. Also, the
existing option 'cache-size' can limit the sum of both L2 and refcount
caches, as previously.
Signed-off-by: Leonid Bloch <lbloch@janustech.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'tests/qemu-iotests/137')
| -rwxr-xr-x | tests/qemu-iotests/137 | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/tests/qemu-iotests/137 b/tests/qemu-iotests/137 index 8796562..19e8597 100755 --- a/tests/qemu-iotests/137 +++ b/tests/qemu-iotests/137 @@ -109,7 +109,6 @@ $QEMU_IO \ -c "reopen -o cache-size=1M,l2-cache-size=64k,refcount-cache-size=64k" \ -c "reopen -o cache-size=1M,l2-cache-size=2M" \ -c "reopen -o cache-size=1M,refcount-cache-size=2M" \ - -c "reopen -o l2-cache-size=256T" \ -c "reopen -o l2-cache-entry-size=33k" \ -c "reopen -o l2-cache-entry-size=128k" \ -c "reopen -o refcount-cache-size=256T" \ @@ -119,6 +118,13 @@ $QEMU_IO \ -c "reopen -o cache-clean-interval=-1" \ "$TEST_IMG" | _filter_qemu_io +IMGOPTS="cluster_size=256k" _make_test_img 32P +$QEMU_IO \ + -c "reopen -o l2-cache-entry-size=512,l2-cache-size=1T" \ + "$TEST_IMG" | _filter_qemu_io + +_make_test_img 64M + echo echo === Test transaction semantics === echo |