On Thu, Jul 26, 2012 at 10:52:08PM -0700, Adrian Chadd wrote:
On 25 July 2012 08:14, Luigi Rizzo ri...@iet.unipi.it wrote:
I suggest doing some digging to understand why. I bet we all know the
answer, but it would be nice to have it documented and investigated. I
bet em(4) isn't the only
Hm.
Ok, I wonder whether it's a general case of touching the hardware too
much versus a more specific case of all that taskqueue scheduling
overhead is killing us in virtualised environments.
Adrian
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On 25 July 2012 08:14, Luigi Rizzo ri...@iet.unipi.it wrote:
I suggest doing some digging to understand why. I bet we all know the
answer, but it would be nice to have it documented and investigated. I
bet em(4) isn't the only device that would benefit from this?
I am not so sure i know the
lem is also used under VMware. Performance and stability should be tested
there, too, before this change.
-Andrew
On Jul 24, 2012, at 4:20 PM, Luigi Rizzo wrote:
if_lem.c (lem, one of the e1000 drivers) has 2 possible interrupt modes:
EM_LEGACY_IRQ uses the standard dispatch mechanism,
On Wed, Jul 25, 2012 at 09:08:42AM -0400, Andrew Boyer wrote:
lem is also used under VMware. Performance and stability should be tested
there, too, before this change.
i do not have VMware so i cannot test it myself, but at the end of this
email you can find a suitable image and instructions
On 24 July 2012 13:20, Luigi Rizzo ri...@iet.unipi.it wrote:
if_lem.c (lem, one of the e1000 drivers) has 2 possible interrupt modes:
EM_LEGACY_IRQ uses the standard dispatch mechanism, whereas
FAST_INTR has a custom handler that signals a taskqueue to do the job.
I have no idea which actual
On Wed, Jul 25, 2012 at 07:48:57AM -0700, Adrian Chadd wrote:
On 24 July 2012 13:20, Luigi Rizzo ri...@iet.unipi.it wrote:
if_lem.c (lem, one of the e1000 drivers) has 2 possible interrupt modes:
EM_LEGACY_IRQ uses the standard dispatch mechanism, whereas
FAST_INTR has a custom handler that
if_lem.c (lem, one of the e1000 drivers) has 2 possible interrupt modes:
EM_LEGACY_IRQ uses the standard dispatch mechanism, whereas
FAST_INTR has a custom handler that signals a taskqueue to do the job.
I have no idea which actual hardware uses it (all of my Intel 1G
cards use either em or igb),
Interesting, lem is all the non-pcie hardware, and if you see better
performance
out of the LEGACY path then I'm OK with changing the default.
Jack
On Tue, Jul 24, 2012 at 1:20 PM, Luigi Rizzo ri...@iet.unipi.it wrote:
if_lem.c (lem, one of the e1000 drivers) has 2 possible interrupt modes:
