This one as a signed tag on github, in case the inline patch was
the reason you dropped this.
virtio-mmio in new 3.2, and they found a corruption bug. Please apply.
* [new tag] rusty@xxxxxxxxxxxxxxx -> rusty@xxxxxxxxxxxxxxx
The following changes since commit b3b1b70e62a603f473619dbebc3b3d23f535e6f8:
Merge branch 'usb-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb (2011-12-22 12:59:47 -0800)
are available in the git repository at:
git://github.com/rustyrussell/linux.git master
Rusty Russell (1):
virtio: harsher barriers for virtio-mmio.
drivers/lguest/lguest_device.c | 8 +++++---
drivers/s390/kvm/kvm_virtio.c | 2 +-
drivers/virtio/virtio_mmio.c | 7 ++++---
drivers/virtio/virtio_pci.c | 4 ++--
drivers/virtio/virtio_ring.c | 34 +++++++++++++++++++++-------------
include/linux/virtio_ring.h | 1 +
tools/virtio/linux/virtio.h | 1 +
tools/virtio/virtio_test.c | 3 ++-
8 files changed, 37 insertions(+), 23 deletions(-)
commit ef3a731beb9a030e552945a734dc898b5525e2f7
Author: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Date: Fri Dec 23 15:07:56 2011 +1030
virtio: harsher barriers for virtio-mmio.
We were cheating with our barriers; using the smp ones rather than the
real device ones. That was fine, until virtio-mmio came along, which
could be talking 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 <rusty@xxxxxxxxxxxxxxx>
drivers/lguest/lguest_device.c | 8 +++++---
drivers/s390/kvm/kvm_virtio.c | 2 +-
drivers/virtio/virtio_mmio.c | 7 ++++---
drivers/virtio/virtio_pci.c | 4 ++--
drivers/virtio/virtio_ring.c | 34 +++++++++++++++++++++-------------
include/linux/virtio_ring.h | 1 +
tools/virtio/linux/virtio.h | 1 +
tools/virtio/virtio_test.c | 3 ++-
8 files changed, 37 insertions(+), 23 deletions(-)
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