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2013 Jul 17
1
syncer causing latency spikes
...particular). The system has an LSI 9261-8i RAID controller (backed by
mfi(4)) and the database and WALs are on separate volumes, a RAID 6 and
a RAID 1 respectively. It has about 96GB of RAM installed.
What's happening is that the syncer tries to fsync a large database file
and goes to sleep in getpbuf() with the corresponding vnode lock held
and the following stack:
#3 0xffffffff805fceb5 in _sleep (ident=0xffffffff80ca8e20, lock=0xffffffff80d6bc20, priority=-2134554464, wmesg=0xffffffff80a4fe43 "wswbuf0", timo=0) at /d2/usr/src/sys/kern/kern_synch.c:234
#4 0xffffffff808780d5 in getp...