Date: Sat, 26 Mar 2016 16:31:33 -0700 (PDT) From: Don Lewis <truckman@FreeBSD.org> To: phk@phk.freebsd.dk Cc: ultima1252@gmail.com, freebsd-current@freebsd.org Subject: Re: CURRENT slow and shaky network stability Message-ID: <201603262331.u2QNVXVm080178@gw.catspoiler.org> In-Reply-To: <84490.1459033102@critter.freebsd.dk>
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On 26 Mar, Poul-Henning Kamp wrote: > -------- > In message <CANJ8om5rkNAuY0j-undf9A8stJ1LD2yHo4xfqgG1qODeAGvqVA@mail.gmail.com> > , Ultima writes: > >> A large zfs send [...] > > I am not running zfs. I am. I'm not seeing any unexpected problems. I haven't really loaded this system up with a big poudriere run since it's been booted. It's mostly just been singled-threaded compiles since then. A bit of swap is used and free memory is kind of low. In my case the culprit seems to be ARC. last pid: 28589; load averages: 1.06, 1.09, 1.08 up 3+15:55:10 16:12:51 71 processes: 2 running, 63 sleeping, 6 stopped CPU: 7.0% user, 0.0% nice, 0.9% system, 0.0% interrupt, 92.1% idle Mem: 564M Active, 6787M Inact, 23G Wired, 277M Buf, 656M Free ARC: 16G Total, 5494M MFU, 2062M MRU, 499K Anon, 573M Header, 8434M Other Swap: 40G Total, 4108K Used, 40G Free When I'm making heavy use of poudriere, swap usage goes up a lot and the pressure on free memory decreases the ARC size significantly. It's a headless machine accessed via ssh, so I won't see any issues with Xorgs and its clients getting paged out. Remote shell access seems to perform ok for me. Before r297203 I was running r296416 and really pushed it hard. I didn't observe any unexpected interactivity issues even with more than 10G of swap used and a load average over 50. I'd love to add more RAM, but the motherboard is at max capacity. The problems that some are describing sound a lot like lost interrupts or lost wakeups. The former could easily be hardware dependant. My FreeBSD 10.3-PRERELEASE desktop is worse under load. It also uses zfs, but only has 8 GB of RAM. The main culprit is firefox, which gets very bloated after a while. I've got some other hoggish processes on it, which doesn't help.
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