Re: extreme network latency

2016-10-17 Thread Sepherosa Ziehau
On Tue, Oct 18, 2016 at 4:17 AM, Richard Nyberg wrote: > Yes, that was it. Many thanks! > > Should I just use polling, which works fine, or is there something one > can do about the interrupt issue? Heh, I'd say avoid re :). Try put the following tunable:

Re: extreme network latency

2016-10-17 Thread Matthew Dillon
Our network dev Sephe might be able to work out why the NICs are interfering with each other, but it depends how old they are. If they are old card(s) and/or it is an old motherboard, it might not be worth tracking down. Polling is a perfectly acceptable solution for older stuff. If the NICs

Re: extreme network latency

2016-10-17 Thread Richard Nyberg
Yes, that was it. Many thanks! Should I just use polling, which works fine, or is there something one can do about the interrupt issue? -Richard On 17 October 2016 at 22:05, Matthew Dillon wrote: > That kinda sounds like an interrupt issue, in which case I suggest turning

Re: extreme network latency

2016-10-17 Thread Matthew Dillon
That kinda sounds like an interrupt issue, in which case I suggest turning polling on for both interfaces. ifconfig polling ought to do it. If that fixes the problem, then it is definitely interrupt-related. -Matt On Mon, Oct 17, 2016 at 12:52 PM, Richard Nyberg wrote:

Re: extreme network latency

2016-10-17 Thread Richard Nyberg
Thanks again for your suggestions. Actually it's much stranger than I thought. While troubleshooting I had this configuration: df (em0) -> switch <- desktop No other devices or network interfaces were connected. In this configuration there was no problem at all with latency. I then plugged in