|author||Rusty Russell <firstname.lastname@example.org>||2012-01-12 15:44:42 +1030|
|committer||Rusty Russell <email@example.com>||2012-01-12 15:44:42 +1030|
virtio: harsher barriers for rpmsg.
We were cheating with our barriers; using the smp ones rather than the real device ones. That was fine, until rpmsg came along, which is used to talk to a real device (a non-SMP CPU). Unfortunately, just putting back the real barriers (reverting d57ed95d) causes a performance regression on virtio-pci. In particular, Amos reports netbench's TCP_RR over virtio_net CPU utilization increased up to 35% while throughput went down by up to 14%. By comparison, this branch is in the noise. Reference: https://lkml.org/lkml/2011/12/11/22 Signed-off-by: Rusty Russell <firstname.lastname@example.org>
Diffstat (limited to 'lib')
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