From: Lou Picciano [mailto:loupicci...@comcast.net] > Yes, Jason, now that James has mentioned the 'Interrupt Storm' matter... > You've piqued my interest. Any chance you're having all these problems on > a SandyBridge system? Would love to hear more. In our case, we'd seen > interrupt faults rising into the _multiple millions_, over a 5-second > interval, before all hell started breaking loose. Though our (latest > Series of) problems were not network-related, they may be responsible for > problems with ZFS. Hi Lou, It is an L5630 CPU, so no Sandy Bridge. My interrupts count totals between 16k-30k, normally, depending on network load. We some times see decent size spikes on each web server where in bound http traffic increases to the tune of 100 mb/s per box. This generally triggers about 150k pps/physical server. I would imagine interrupts are near those levels as well. I haven't instrumented interrupt activity yet but it appears nominal to me. An interrupt storm was the first thing I looked at about four weeks ago. I just don't see any evidence of it. I don't have much going on in terms of zfs i/o. I am only logging proxy errors to upstream servers. I found that about 8 megabits of traffic or less, my problem disappears. The problem is at 8 megabits, I have a cost ineffective platform. Thanks, j.
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