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SubjectRe: Complete freeze with 2.4.20 on 4-proc IBM xSeries 350
On Tue, Dec 10, 2002 at 04:10:21PM -0800, Martin J. Bligh wrote:
> > I'm experiencing serious problems with Kernel 2.4.20 on a IBM xSeries 350
> > machine, having 4 700 MHz processors and 4 GB RAM (same on another machine
> > with the same configuration, but only 3 GB RAM). The machine just com-
> > pletely freezes after some time, ranging from 20 minutes to 3 hours. It
> > is running IBM DB/2 with quite some load, the base system is RedHat 7.2
> > with all the updates applied. There is no oops or other fault, just a
> > plain freeze.
>
> Can you watch /proc/meminfo and see how low "lowfree" gets?
> If it gets low (eg below 50Mb), dump /proc/slabinfo as well.

I'm running off a Soyo Dragon KT400 board, single AMD 2400+
processor, 1GB ram (4GB limit set in kernel), and was also having
freezes, apparently related to having software raid 1 in use (on two
drives sitting on the on-board Highpoint controller). If I started a
large data transfer over the net, the machine would freeze after some
time ranging from a few minutes to an hour, with either 2.4.20-ac2 or
2.4.21-pre2. I tried letting the system resync before restarting, and
the first pass through it actually froze during resyncing, with
nothing special going on. Later, after a resync, I started trying all
sorts of things, from turning off XFree86 and running a minimal set of
loaded modules, to using mdadm to fail one of the drives (it was a
RAID1 setup) to force only a single disk to be in use. Right now,
I've taken it off of RAID entirely, and am mounting /dev/hdex
directly, and copying data to that, and it seems to be okay so far
(for the last hour or so).


cat /proc/meminfo gives:

total: used: free: shared: buffers: cached:
Mem: 1055412224 1045782528 9629696 0 90771456 720228352
Swap: 526376960 39202816 487174144
MemTotal: 1030676 kB
MemFree: 9404 kB
MemShared: 0 kB
Buffers: 88644 kB
Cached: 684644 kB
SwapCached: 18704 kB
Active: 540556 kB
Inact_dirty: 356560 kB
Inact_clean: 44764 kB
Inact_target: 188376 kB
HighTotal: 131008 kB
HighFree: 1024 kB
LowTotal: 899668 kB
LowFree: 8380 kB
SwapTotal: 514040 kB
SwapFree: 475756 kB
Committed_AS: 322008 kB


So if you were concerned about LowFree going low, it is.

/proc/slabinfo:

slabinfo - version: 1.1
kmem_cache 68 68 112 2 2 1
fib6_nodes 5 112 32 1 1 1
ip6_dst_cache 5 20 192 1 1 1
ndisc_cache 1 30 128 1 1 1
ip_conntrack 10 24 320 2 2 1
tcp_tw_bucket 0 0 128 0 0 1
tcp_bind_bucket 25 112 32 1 1 1
tcp_open_request 0 0 128 0 0 1
inet_peer_cache 0 0 64 0 0 1
ip_fib_hash 9 112 32 1 1 1
ip_dst_cache 12 40 192 2 2 1
arp_cache 3 30 128 1 1 1
urb_priv 4 59 64 1 1 1
blkdev_requests 1408 1410 128 47 47 1
nfs_write_data 0 0 384 0 0 1
nfs_read_data 0 0 384 0 0 1
nfs_page 0 0 128 0 0 1
journal_head 26 77 48 1 1 1
revoke_table 1 250 12 1 1 1
revoke_record 0 0 32 0 0 1
dnotify_cache 0 0 20 0 0 1
file_lock_cache 4 40 96 1 1 1
fasync_cache 1 202 16 1 1 1
uid_cache 6 112 32 1 1 1
skbuff_head_cache 163 260 192 13 13 1
sock 201 204 896 51 51 1
sigqueue 1 29 132 1 1 1
kiobuf 0 0 64 0 0 1
cdev_cache 22 472 64 8 8 1
bdev_cache 9 59 64 1 1 1
mnt_cache 18 59 64 1 1 1
inode_cache 54639 57071 512 8153 8153 1
dentry_cache 804 4050 128 135 135 1
dquot 0 0 128 0 0 1
filp 1563 1590 128 53 53 1
names_cache 0 2 4096 0 2 1
buffer_head 185515 191520 128 6368 6384 1
mm_struct 63 80 192 4 4 1
vm_area_struct 2749 2850 128 92 95 1
fs_cache 62 118 64 2 2 1
files_cache 62 63 448 7 7 1
signal_act 71 75 1344 24 25 1
pte_chain 70104 74592 8 221 222 1
size-131072(DMA) 0 0 131072 0 0 32
size-131072 0 0 131072 0 0 32
size-65536(DMA) 0 0 65536 0 0 16
size-65536 2 2 65536 2 2 16
size-32768(DMA) 0 0 32768 0 0 8
size-32768 2 2 32768 2 2 8
size-16384(DMA) 0 0 16384 0 0 4
size-16384 2 7 16384 2 7 4
size-8192(DMA) 0 0 8192 0 0 2
size-8192 15 19 8192 15 19 2
size-4096(DMA) 0 0 4096 0 0 1
size-4096 121 139 4096 121 139 1
size-2048(DMA) 0 0 2048 0 0 1
size-2048 50 130 2048 26 65 1
size-1024(DMA) 0 0 1024 0 0 1
size-1024 53 60 1024 14 15 1
size-512(DMA) 0 0 512 0 0 1
size-512 99 120 512 13 15 1
size-256(DMA) 0 0 256 0 0 1
size-256 86 120 256 6 8 1
size-128(DMA) 3 30 128 1 1 1
size-128 953 990 128 33 33 1
size-64(DMA) 0 0 64 0 0 1
size-64 776 1062 64 17 18 1
size-32(DMA) 52 59 64 1 1 1
size-32 714 767 64 13 13 1


Does this provide you with any useful information?

--
Zed Pobre <zed@debian.org> a.k.a. Zed Pobre <zed@resonant.org>
PGP key and fingerprint available on finger; encrypted mail welcomed.
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