Got an issue which is rather annoying to me - three of my
ZFS caches are regularly using nearly 1/2 of the 1.09Gb of
allocated kmem in my system
ultra20 m2
1x 2.2GHz dual-core Opteron
2Gb ram, 16Gb swap
2 zpools, not ZFS root
snv_77
2 non-global zones.
This is the SUNWscat "suspect caches" report:
==== reporting kmem stats, just the suspect caches ====
suspect buf buf buf memory #allocations
cache name size avail total in use succeed fail
------------------------- ------ ------- ------- --------- ---------- ----
kmem_bufctl_cache 24 161952 1089984 26574848 7720657 0 *
kmem_alloc_8192 8192 48 5505 45096960 6685148 0
kmem_io_2G_2048 2048 6 12296 25182208 43011 0
rootnex_dmahdl 2504 83 20840 53350400 63862899 0
vn_cache 264 75854 171780 58634240 152439475 0
anon_cache 48 25482 487620 23777280 30578955 0
ufs_inode_cache 368 32628 58480 23953408 8207842 0
zio_buf_512 512 114409 303440 155361280 11614738 0 *
zio_buf_16384 16384 3 7074 115900416 2109727 0 *
zio_buf_65536 65536 1 645 42270720 1218805 0 *
dmu_buf_impl_t 192 196172 392301 76517376 18875286 0
dnode_t 656 144388 335226 228847616 7245893 0
zfs_znode_cache 200 71534 133420 27324416 8670673 0
------------------------- ------ ------- ------- --------- ---------- ----
total memory - - - 1080578048 4744404583 0
....
unix:segkmem_alloc_io_2G+0x0 24.0M
unix:segkmem_alloc_io_16M+0x0 0
unix:bp_vmem_alloc+0x0 768K
unix:hat_memload_alloc+0x0 9.80M
unix:segkmem_alloc_permanent+0x0 0
unix:segkmem_alloc+0x0 1.09G <<<<<<<<<<<
unix:segkmem_zio_alloc+0x0 10.0M
genunix:kmem_firewall_va_alloc+0x0 64.0M
genunix:devmap_alloc_pages+0x0 896K
genunix:vmem_alloc+0x0 1.21G <<<<<<<<<<<
This all has the effect of my system constantly swapping and
interactive response for my desktop is horrendous.
What can I do to find out why this is happening, and prevent
it recurring?
(If Team ZFS would like access to the core please contact me
directly for access).
thanks in advance,
James C. McPherson
--
Senior Kernel Software Engineer, Solaris
Sun Microsystems
http://blogs.sun.com/jmcp http://www.jmcp.homeunix.com/blog
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