From 95f7142abc86a916682bd735aecd90172ffa0d30 Mon Sep 17 00:00:00 2001 From: Peter Lieven Date: Mon, 2 Feb 2015 14:52:21 +0100 Subject: virtio-blk: introduce multiread this patch finally introduces multiread support to virtio-blk. While multiwrite support was there for a long time, read support was missing. The complete merge logic is moved into virtio-blk.c which has been the only user of request merging ever since. This is required to be able to merge chunks of requests and immediately invoke callbacks for those requests. Secondly, this is required to switch to direct invocation of coroutines which is planned at a later stage. The following benchmarks show the performance of running fio with 4 worker threads on a local ram disk. The numbers show the average of 10 test runs after 1 run as warmup phase. | 4k | 64k | 4k MB/s | rd seq | rd rand | rd seq | rd rand | wr seq | wr rand --------------+--------+---------+--------+---------+--------+-------- master | 1221 | 1187 | 4178 | 4114 | 1745 | 1213 multiread | 1829 | 1189 | 4639 | 4110 | 1894 | 1216 Signed-off-by: Peter Lieven Signed-off-by: Kevin Wolf --- trace-events | 1 + 1 file changed, 1 insertion(+) (limited to 'trace-events') diff --git a/trace-events b/trace-events index 907da7ed8a..57f357f7f7 100644 --- a/trace-events +++ b/trace-events @@ -116,6 +116,7 @@ virtio_blk_req_complete(void *req, int status) "req %p status %d" virtio_blk_rw_complete(void *req, int ret) "req %p ret %d" virtio_blk_handle_write(void *req, uint64_t sector, size_t nsectors) "req %p sector %"PRIu64" nsectors %zu" virtio_blk_handle_read(void *req, uint64_t sector, size_t nsectors) "req %p sector %"PRIu64" nsectors %zu" +virtio_blk_submit_multireq(void *mrb, int start, int num_reqs, uint64_t sector, size_t nsectors, bool is_write) "mrb %p start %d num_reqs %d sector %"PRIu64" nsectors %zu is_write %d" # hw/block/dataplane/virtio-blk.c virtio_blk_data_plane_start(void *s) "dataplane %p" -- cgit v1.2.3