Dan, I had a look at HVM-807 you mentioned.
Shouldn't line 251 in 'net/vnic.c' be
for (i = 0; i < MIN(iovcnt, FRAMEIO_NVECS_MAX); i++, iov++) {
instead of
for (i = 0; i < MIN(iovcnt, FRAMEIO_NVECS_MAX - 1); i++, iov++) {
As otherwise the last element of the frameio will not be used at all if
iovcnt is greater than the frameio buffer size?
Kind regards
Dominik
On 02/20/2015 09:17 PM, Dan McDonald wrote:
>
>> On Feb 20, 2015, at 2:58 PM, Tobias Oetiker <t...@oetiker.ch> wrote:
>>
>> Hi Dan,
>>
>> I do not have a spare machine to test this, but if the dramatic
>> network io performance regression for kvm present in r151012 has
>> not been fixed in r151014 then we will be stranded on r151010.
>
> And the upstreaming of VND is likely not to happen with this release. That
> blocks us from properly catching up with illumos-kvm-cmd.
>
> There are several commits (Starting with the March 19th one we can't bring in
> w/o VND) here:
>
> https://github.com/joyent/illumos-kvm-cmd/commits/master
>
> Currently, we only backport the most recent fix about QEMU using
> preadv/pwritev recklessly. IF (big if) there are other commits we can
> backport, you could try it using the patches/ directory of omnios-build. I'm
> thinking maybe HVM-807's may help you (provided that's indepdent of VND
> support).
>
> Have you seen anything with dtrace or lockstat that could give a clue to
> what's holding things up? I don't recall seeing anything observed.
>
>> Judging from the echo on the ML, not many people seem to see this
>> problem, or care about it.
>
> I'm sorry, but that does appear to be the case.
>
> Next week I disappear for other-customer work, but starting in March, I'm
> doing nothing but r151014.
>
> Dan
>
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