:: I booted my system this morning. During the day, it did not much
:: else than light mail trafic. At 3 pm I noticed from the unresponsivness
:: of the system that not everything was quite the same as in the
:: morning. Memory usage 200MB, free 56. Quite large numbers for
:: xfs_inode and inode_cache in /proc/slabinfo.
I don't know if this is related, but on a fresh install of XFS 1.0 (2.4.2),
I find that just after reboot, I get ~87-88MBps with hdparm buffer-cache
reads; after the system's been up and running (basically doing very little),
this drops to around 55MBps.
I see a similar drop in performance with Bonnie. The char/sec sequential
output figure drops from ~5,800KBps to 3,500KBps. If I reboot, performance
numbers go back to normal.
So... the question is, is it XFS, is it the Linux VM, the SCSI driver (it's
a Symbios sym53c8xx F/W SCSI), or a combination of all three?
# free
total used free shared buffers cached
Mem: 190288 186264 4024 0 65536 17140
-/+ buffers/cache: 103588 86700
Swap: 525656 32 525624
# cat /proc/slabinfo | grep xfs
xfs_chashlist 2613 2626 16 13 13 1 : 252 126
xfs_ili 108 168 136 6 6 1 : 252 126
xfs_ifork 0 0 56 0 0 1 : 252 126
xfs_efi_item 14 15 260 1 1 1 : 124 62
xfs_efd_item 14 30 260 1 2 1 : 124 62
xfs_buf_item 27 52 148 2 2 1 : 252 126
xfs_dabuf 202 202 16 1 1 1 : 252 126
xfs_da_state 11 11 340 1 1 1 : 124 62
xfs_gap 0 0 16 0 0 1 : 252 126
xfs_trans 2 36 320 1 3 1 : 124 62
xfs_inode 66634 72667 536 9839 10381 1 : 124 62
xfs_btree_cur 56 56 140 2 2 1 : 252 126
xfs_bmap_free_item 202 202 16 1 1 1 : 252 126
blkdev_requests 1536 1560 96 39 39 1 : 252 126
dnotify cache 0 0 20 0 0 1 : 252 126
file lock cache 2 42 92 1 1 1 : 252 126
fasync cache 0 0 16 0 0 1 : 252 126
uid_cache 1 113 32 1 1 1 : 252 126
skbuff_head_cache 161 384 160 16 16 1 : 252 126
sock 17 24 928 6 6 1 : 124 62
page_buf_t 240 240 160 10 10 1 : 252 126
page_buf_reg_t 6 113 32 1 1 1 : 252 126
avl_object_t 7 113 32 1 1 1 : 252 126
avl_entry_t 226 226 32 2 2 1 : 252 126
inode_cache 67504 69960 480 8745 8745 1 : 124 62
bdev_cache 44 118 64 2 2 1 : 252 126
sigqueue 29 29 132 1 1 1 : 252 126
kiobuf 47 180 128 6 6 1 : 252 126
dentry_cache 41994 59640 128 1988 1988 1 : 252 126
dquot 0 0 128 0 0 1 : 252 126
filp 268 280 96 7 7 1 : 252 126
names_cache 2 2 4096 2 2 1 : 60 30
buffer_head 66640 66640 96 1666 1666 1 : 252 126
mm_struct 120 120 160 5 5 1 : 252 126
vm_area_struct 755 826 64 14 14 1 : 252 126
fs_cache 177 177 64 3 3 1 : 252 126
files_cache 63 63 416 7 7 1 : 124 62
signal_act 45 45 1312 15 15 1 : 60 30
Will boot the system up with just an IDE drive to see if the symptoms
persist.
Cheers,
-- Juha
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