Date: Sun, 7 Dec 2014 10:40:05 +0100 (CET) From: Wojciech Puchar <wojtek@puchar.net> To: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: 10.1-STABLE one week old from svn - random hangs Message-ID: <alpine.BSF.2.11.1412071035550.697@laptop>
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i have a problem with FreeBSD-10. To make it more probable one have to 1) reduce maxbcache. eg kern.maxbcache=50000000 in loader.conf but NOT doing this doesn't make problem disappear. it is just more rare. 2) use swap. But you don't need system that swaps heavily. Probably - it may not swap at all. 3) do lots of I/O 4) it is more often if you use virtualbox, but still - it is not required, just make problem more common. The problem. At random moment system I/O stops. If you are running top at this moment, there are lots of prosesses stalled in vnread or biord. network keeps running, processes that doesn't need I/O still runs. top often reports at least 10MB free memory. seems like a deadlock. Anyone know that problem. How to trace it down?
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