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os/bluestore: set min compressed blob size floor at 2x min_alloc_size

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Otherwise there's not point in compressing--we won't be able to
allocation a smaller space to store it.

Signed-off-by: Sage Weil <sage@redhat.com>
This commit is contained in:
Sage Weil 2016-09-27 13:59:29 -04:00
parent 87f6d23b2f
commit beed433254
1 changed files with 7 additions and 0 deletions
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7
src/os/bluestore/BlueStore.cc
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@ -7687,6 +7687,13 @@ int BlueStore::_do_write(
wctx.target_blob_size > g_conf->bluestore_max_blob_size) {
wctx.target_blob_size = g_conf->bluestore_max_blob_size;
}
// set the min blob size floor at 2x the min_alloc_size, or else we
// won't be able to allocate a smaller extent for the compressed
// data.
if (wctx.compress &&
wctx.target_blob_size < min_alloc_size * 2) {
wctx.target_blob_size = min_alloc_size * 2;
}
dout(20) << __func__ << " prefer csum_order " << wctx.csum_order
<< " target_blob_size 0x" << std::hex << wctx.target_blob_size