On Mon, Aug 17, 2020 at 12:15:53PM +0300, Vladimir Sementsov-Ogievskiy wrote: > vstorage has slow allocation, so this patch detect vstorage > (I hope, we don't use other FUSE filesystems) and inserts preallocate > filter between qcow2 node and its file child. > > The following test executes more than 10 times faster > (43.2s -> 3.9s for me) with this patch. (/newssd3 is mount point of > vstorage, both cs and mds are on same ssd local ssd disk) > > IMG=/newssd3/z > FILE_OPTS=file.filename=$IMG > COUNT=15000 > CHUNK=64K > CLUSTER=1M > rm -f $IMG > ./qemu-img create -f qcow2 -o cluster_size=$CLUSTER $IMG 1G > ./qemu-img bench -c $COUNT -d 1 -s $CHUNK -w -t none -f qcow2 $IMG
Kevin's input is needed here. I think the philosophy is that nodes are not automatically inserted. The user should define the graph explicitly. The management tool would be responsible for configuring a preallocate filter node.
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