[solved!] Re: em very slow, shared irq... on 6.2p8

[Holger Kipp]

On Wed, Feb 27, 2008 at 08:50:58PM +0100, Holger Kipp wrote:
> On Wed, Feb 27, 2008 at 09:50:16AM -0500, Mike Tancsa wrote:
> 
> more details below. as it currently is, polling seems to do
> the trick, however handling several em-interfaces with the
> same irq (mind you, it is pci) shouldn't cause delays of
> up to 1.5 seconds for a simple ping... Therefore I consider
> using polling for a nearly idle system more a workaround
> than a solution to this problem :-(
[...]
> with msi enabled (via sysctl) I get
> 
> 33 packets transmitted, 33 packets received, 0% packet loss
> round-trip min/avg/max/stddev = 1.865/156.421/1339.841/239.375 ms
> 
> so looks equally bad (I don't consider 30-40 packets a meaningful sample).
> I don't know if it makes any differences if switched on directly in
> loader.conf, though.

have now activated msi in loader.conf and get very good results again.

38 packets transmitted, 38 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.291/0.425/0.595/0.067 ms

without polling activated. So it was msi after all I needed here.
Maybe this should go into docu for em or ifconfig?

> enabling polling (withous MSI) gives
> 
> 30 packets transmitted, 30 packets received, 0% packet loss
> round-trip min/avg/max/stddev = 0.366/0.790/1.339/0.290 ms

this is still the same with msi activated in loader.conf

Best regards,
Holger Kipp