I'll set some time aside next week to drill into that. I certainly
don't recall seeing any utilization issues when I was first
troubleshooting.
On 24 January 2014 07:26, Salvatore Orlando wrote:
> Hi,
>
> My expertise on the subject is pretty much zero, but the performance loss
> (which I think i
Hi,
My expertise on the subject is pretty much zero, but the performance loss
(which I think is throughput loss) is so blatant that perhaps there's more
than the MTU issue. From what Robert writes, GRO definitely plays a role
too.
My only suggestion would be to route the question to ovs-discuss i
On 01/22/2014 03:01 AM, Robert Collins wrote:
I certainly think having the MTU set to the right value is important.
I wonder if there's a standard way we can signal the MTU (e.g. in the
virtio interface) other than DHCP. Not because DHCP is bad, but
because that would work with statically injecte
On 22 January 2014 12:01, Robert Collins wrote:
> > Getting the MTU *right* on all hosts seems to be key to keeping your hair
> > attached to your head for a little longer. Hence the DHCP suggestion to
> set
> > it to the right value.
>
> I certainly think having the MTU set to the right value i
On 22 January 2014 21:28, Ian Wells wrote:
> On 22 January 2014 00:00, Robert Collins wrote:
>>
>> I think dropping frames that can't be forwarded is entirely sane - at
>>
>> a guess it's what a physical ethernet switch would do if you try to
>> send a 1600 byte frame (on a non-jumbo-frame switch
On 22 January 2014 00:00, Robert Collins wrote:
> I think dropping frames that can't be forwarded is entirely sane - at
>
a guess it's what a physical ethernet switch would do if you try to
> send a 1600 byte frame (on a non-jumbo-frame switched network) - but
> perhaps there is an actual standar
On 22 January 2014 10:01, Ian Wells wrote:
> On 21 January 2014 21:23, Robert Collins wrote:
>>
>> In OpenStack we've got documentation[1] that advises setting a low MTU
>> for tenants to workaround this issue (but the issue itself is
>> unsolved) - this is a problem because PMTU is fairly import
On 21 January 2014 21:23, Robert Collins wrote:
> In OpenStack we've got documentation[1] that advises setting a low MTU
> for tenants to workaround this issue (but the issue itself is
> unsolved) - this is a problem because PMTU is fairly important :)
> Lowering *every* tenant when one tenant so
