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os/bluestore: use larger csum blocks for sequential writes

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Signed-off-by: Sage Weil <sage@redhat.com>
This commit is contained in:
Sage Weil 2016-06-06 10:12:33 -04:00
parent cfc688d01e
commit d9648dc0dc
1 changed files with 18 additions and 3 deletions
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21
src/os/bluestore/BlueStore.cc
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@ -5961,6 +5961,13 @@ int BlueStore::_do_alloc_write(
}
} else {
b->set_flag(bluestore_blob_t::FLAG_MUTABLE);
if (l->length() != b->length &&
csum_order != block_size_order) {
// hrm, maybe we could do better here, but let's not bother.
dout(20) << __func__ << " downgrading csum_order from " << csum_order
<< " to block_size_order " << block_size_order << dendl;
csum_order = block_size_order;
}
}
while (final_length > 0) {
bluestore_pextent_t e;
@ -5977,7 +5984,10 @@ int BlueStore::_do_alloc_write(
final_length -= e.length;
hint = e.end();
}
dout(20) << __func__ << " blob " << *b << dendl;
dout(20) << __func__ << " blob " << *b
<< " csum_order " << csum_order
<< " csum_length 0x" << std::hex << csum_length << std::dec
<< dendl;
// checksum
if (csum_type) {
@ -6090,10 +6100,15 @@ int BlueStore::_do_write(
(alloc_hints & CEPH_OSD_ALLOC_HINT_FLAG_RANDOM_READ) == 0 &&
(alloc_hints & (CEPH_OSD_ALLOC_HINT_FLAG_IMMUTABLE|
CEPH_OSD_ALLOC_HINT_FLAG_APPEND_ONLY)) &&
(alloc_hints & CEPH_OSD_ALLOC_HINT_FLAG_RANDOM_WRITE) == 0)
(alloc_hints & CEPH_OSD_ALLOC_HINT_FLAG_RANDOM_WRITE) == 0) {
wctx.comp_blob_size = comp_max_blob_size;
else
wctx.csum_order = min_alloc_size_order;
} else {
wctx.comp_blob_size = comp_min_blob_size;
}
dout(20) << __func__ << " prefer csum_order " << wctx.csum_order
<< " comp_blob_size 0x" << std::hex << wctx.comp_blob_size
<< std::dec << dendl;
// write in buffer cache
o->bc.write(txc->seq, offset, bl, wctx.buffered ? 0 : Buffer::FLAG_NOCACHE);