Displaying 3 results from an estimated 3 matches for "vn_write".
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vm_write
2013 Jul 17
1
syncer causing latency spikes
...ta
0xffffff01616d8ce8: pgsql
0xffffff002af9f588: <mount point>
0xffffff002af853b0: d3
0xffffff002abd6b10: /
(kgdb)
During such an fsync, DTrace shows me that syncer sleeps of 50-200ms are
happening up to 8 or 10 times a second. When this happens, a bunch of
postgres threads become blocked in vn_write() waiting for the vnode lock
to become free. It looks like the write-clustering code is limited to
using (nswbuf / 2) pbufs, and FreeBSD prevents one from setting nswbuf
to anything greater than 256.
Since the sleeps are happening in the write-clustering code, I tried
disabling write clustering on...
2003 Jun 07
0
FFS related panic in 4.8-STABLE
...37105 in ffs_alloc (ip=0xc3b56b00, lbn=0, bpref=10480648, size=4096,
cred=0xc42fe400, bnp=0xdfb05d70) at ../../ufs/ffs/ffs_alloc.c:142
#16 0xc0339f32 in ffs_balloc (ap=0xdfb05e2c) at ../../ufs/ffs/ffs_balloc.c:167
#17 0xc03438c9 in ffs_write (ap=0xdfb05e64) at vnode_if.h:1056
#18 0xc026bb5e in vn_write (fp=0xc35e9600, uio=0xdfb05ed4, cred=0xc42fe400,
flags=0, p=0xdfab4440) at vnode_if.h:363
#19 0xc024591d in dofilewrite (p=0xdfab4440, fp=0xc35e9600, fd=4,
buf=0x80616b8, nbyte=2587, offset=-1, flags=0) at ../../sys/file.h:163
#20 0xc02457d6 in write (p=0xdfab4440, uap=0xdfb05f80)
at...
2013 Sep 27
1
9.2-RC4 amd64 panic: vm_page_unwire
...#3 0xffffffff804d857e at vfs_vmio_release+0x10e
#4 0xffffffff804dadc8 at getnewbuf+0x468
#5 0xffffffff804dbb2f at getblk+0x5df
#6 0xffffffff80632bb1 at ffs_balloc_ufs2+0x15c1
#7 0xffffffff8065a8d6 at ffs_write+0x246
#8 0xffffffff8070a18f at VOP_WRITE_APV+0x11f
#9 0xffffffff80505e77 at vn_write+0x1f7
#10 0xffffffff80503b51 at vn_io_fault+0xb1
#11 0xffffffff804a387c at dofilewrite+0x9c
#12 0xffffffff804a3b54 at kern_writev+0x54
#13 0xffffffff804a3bf5 at sys_write+0x65
#14 0xffffffff806afd6f at amd64_syscall+0x3bf
#15 0xffffffff8069a817 at Xfast_syscall+0xf7
Uptime: 6d7h46m14s...