On Jun 28 16:15, Kevin Wolf wrote: > Now that bdrv_graph_wrlock() temporarily drops the AioContext lock that > its caller holds, it can poll without causing deadlocks. We can now > re-enable graph locking. > > This reverts commit ad128dff0bf4b6f971d05eb4335a627883a19c1d. >
I'm seeing a pretty major performance regression on iothread-enabled virtio-blk (and on some on-going iothread hw/nvme work) with this applied. Something like ~300k iops prior to this vs ~200k after on my set up. On master, virtio-blk is currently faster without an iothread (~215k) than with (~200k). I bisected the change in iops to this revert.
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