Le mercredi 23 avril 2008 à 17:05 +0300, Avi Kivity a écrit :
Laurent Vivier wrote:
These two patches allow to batch writes to MMIO.
When kernel has to send MMIO writes to userspace, it stores them
in memory until it has to pass the hand to userspace for another
reason. This avoids to
Laurent Vivier wrote:
Le mercredi 23 avril 2008 à 17:05 +0300, Avi Kivity a écrit :
Laurent Vivier wrote:
These two patches allow to batch writes to MMIO.
When kernel has to send MMIO writes to userspace, it stores them
in memory until it has to pass the hand to userspace for
Anthony Liguori wrote:
The ne2k is pretty mmio heavy. You should be able to observe a boost
with something like iperf (guest=host) I would think if this is a
real savings.
If we're just improving ne2k, the complexity isn't worth it. We have
two better nics which are widely supported in
Le mercredi 23 avril 2008 à 10:10 -0500, Anthony Liguori a écrit :
[...]
The ne2k is pretty mmio heavy. You should be able to observe a boost
with something like iperf (guest=host) I would think if this is a real
savings.
I like your advices :-D
I use iperf with e1000 emulation and a
Laurent Vivier wrote:
Le mercredi 23 avril 2008 à 10:10 -0500, Anthony Liguori a écrit :
[...]
The ne2k is pretty mmio heavy. You should be able to observe a boost
with something like iperf (guest=host) I would think if this is a real
savings.
I like your advices :-D
I use
Le mercredi 23 avril 2008 à 19:25 +0300, Avi Kivity a écrit :
Laurent Vivier wrote:
Le mercredi 23 avril 2008 à 10:10 -0500, Anthony Liguori a écrit :
[...]
The ne2k is pretty mmio heavy. You should be able to observe a boost
with something like iperf (guest=host) I would think if
Laurent Vivier wrote:
Le mercredi 23 avril 2008 à 19:25 +0300, Avi Kivity a écrit :
Laurent Vivier wrote:
Le mercredi 23 avril 2008 à 10:10 -0500, Anthony Liguori a écrit :
[...]
The ne2k is pretty mmio heavy. You should be able to observe a boost
with something like
Anthony Liguori wrote:
How can I check that ? How can I measure latency ?
ping (from guest to host)
The guest will halt anyway, flushing its mmio queue.
Perhaps a ping while a background process spins, consuming all cpu.
--
Do not meddle in the internals of kernels, for they are
Anthony Liguori wrote:
Avi Kivity wrote:
Anthony Liguori wrote:
The ne2k is pretty mmio heavy. You should be able to observe a boost
with something like iperf (guest=host) I would think if this is a
real savings.
If we're just improving ne2k, the complexity isn't worth
Le mercredi 23 avril 2008 à 11:48 -0500, Anthony Liguori a écrit :
Laurent Vivier wrote:
Le mercredi 23 avril 2008 à 19:25 +0300, Avi Kivity a écrit :
Laurent Vivier wrote:
Le mercredi 23 avril 2008 à 10:10 -0500, Anthony Liguori a écrit :
[...]
The ne2k is
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