FAQ
Hi,

I have a centos 5.6 xen vps which loses network connectivity once in a
while with following error.

=========================================
-bash-3.2# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
ping: sendmsg: No buffer space available
ping: sendmsg: No buffer space available
ping: sendmsg: No buffer space available
ping: sendmsg: No buffer space available
=========================================

All my investigation so far led me to believe that it is because
skbuff cache getting full.

=========================================================================

PROC-SLABINFO
skbuff_fclone_cache 227 308 512 7 1 : tunables 54
27 8 : slabdata 44 44 0
skbuff_head_cache 1574 1650 256 15 1 : tunables 120 60
8 : slabdata 110 110 0

SLAB-TOP
Active / Total Objects (% used) : 2140910 / 2200115 (97.3%)
Active / Total Slabs (% used) : 139160 / 139182 (100.0%)
Active / Total Caches (% used) : 88 / 136 (64.7%)
Active / Total Size (% used) : 512788.94K / 520252.14K (98.6%)
Minimum / Average / Maximum Object : 0.02K / 0.24K / 128.00K

OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
664000 620290 93% 0.09K 16600 40 66400K buffer_head
409950 408396 99% 0.21K 22775 18 91100K dentry_cache
343056 340307 99% 0.08K 7147 48 28588K selinux_inode_security
338590 336756 99% 0.74K 67718 5 270872K ext3_inode_cache
143665 143363 99% 0.06K 2435 59 9740K size-64
99540 99407 99% 0.25K 6636 15 26544K size-256
96450 96447 99% 0.12K 3215 30 12860K size-128
60858 60858 100% 0.52K 8694 7 34776K radix_tree_node
12420 11088 89% 0.16K 540 23 2160K vm_area_struct
5895 4185 70% 0.25K 393 15 1572K filp
4816 3355 69% 0.03K 43 112 172K size-32
2904 2810 96% 0.09K 66 44 264K sysfs_dir_cache
2058 1937 94% 0.58K 343 6 1372K proc_inode_cache
1728 1215 70% 0.02K 12 144 48K anon_vma
1650 1590 96% 0.25K 110 15 440K skbuff_head_cache
1498 1493 99% 2.00K 749 2 2996K size-2048
1050 1032 98% 0.55K 150 7 600K inode_cache
792 767 96% 1.00K 198 4 792K size-1024
649 298 45% 0.06K 11 59 44K pid
600 227 37% 0.09K 15 40 60K journal_head
590 298 50% 0.06K 10 59 40K delayacct_cache
496 424 85% 0.50K 62 8 248K size-512
413 156 37% 0.06K 7 59 28K fs_cache
404 44 10% 0.02K 2 202 8K biovec-1
390 293 75% 0.12K 13 30 52K bio
327 327 100% 4.00K 327 1 1308K size-4096
320 190 59% 0.38K 32 10 128K ip_dst_cache
308 227 73% 0.50K 44 7 176K skbuff_fclone_cache
258 247 95% 0.62K 43 6 172K sock_inode_cache
254 254 100% 1.84K 127 2 508K task_struct
252 225 89% 0.81K 28 9 224K signal_cache
240 203 84% 0.73K 48 5 192K shmem_inode_cache
204 204 100% 2.06K 68 3 544K sighand_cache
202 4 1% 0.02K 1 202 4K revoke_table
195 194 99% 0.75K 39 5 156K UDP
159 77 48% 0.07K 3 53 12K eventpoll_pwq
145 139 95% 0.75K 29 5 116K files_cache
144 41 28% 0.02K 1 144 4K journal_handle
140 140 100% 0.88K 35 4 140K mm_struct
140 77 55% 0.19K 7 20 28K eventpoll_epi
135 135 100% 2.12K 135 1 540K kmem_cache
121 45 37% 0.69K 11 11 88K UNIX
119 114 95% 0.52K 17 7 68K idr_layer_cache
118 41 34% 0.06K 2 59 8K blkdev_ioc
112 32 28% 0.03K 1 112 4K tcp_bind_bucket
110 56 50% 0.17K 5 22 20K file_lock_cache
106 35 33% 0.07K 2 53 8K avc_node
105 98 93% 1.50K 21 5 168K TCP
105 100 95% 1.04K 15 7 120K bio_map_info
92 1 1% 0.04K 1 92 4K dnotify_cache
80 18 22% 0.19K 4 20 16K tw_sock_TCP
70 44 62% 0.27K 5 14 20K blkdev_requests
59 23 38% 0.06K 1 59 4K biovec-4
59 13 22% 0.06K 1 59 4K fib6_nodes
59 11 18% 0.06K 1 59 4K ip_fib_hash
59 11 18% 0.06K 1 59 4K ip_fib_alias
53 53 100% 0.07K 1 53 4K taskstats_cache
53 1 1% 0.07K 1 53 4K inotify_watch_cache
48 48 100% 0.16K 2 24 8K sigqueue
48 8 16% 0.08K 1 48 4K crq_pool
45 27 60% 0.25K 3 15 12K mnt_cache
45 29 64% 0.25K 3 15 12K dquot
45 32 71% 0.25K 3 15 12K sgpool-8
40 19 47% 0.19K 2 20 8K key_jar
32 32 100% 0.50K 4 8 16K sgpool-16
32 32 100% 1.00K 8 4 32K sgpool-32
32 32 100% 2.00K 16 2 64K sgpool-64
32 32 100% 4.00K 32 1 128K sgpool-128
31 31 100% 8.00K 31 1 248K size-8192
30 27 90% 1.54K 6 5 48K blkdev_queue
30 14 46% 0.12K 1 30 4K request_sock_TCP
30 3 10% 0.12K 1 30 4K inet_peer_cache

FREE-M
total used free shared buffers cached
Mem: 8192 4821 3370 0 500 2793
-/+ buffers/cache: 1527 6664
Swap: 8191 0 8191

PROC-MEMINFO
MemTotal: 8388608 kB
MemFree: 3451384 kB
Buffers: 512352 kB
Cached: 2860580 kB
SwapCached: 0 kB
Active: 2971812 kB
Inactive: 1178908 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 8388608 kB
LowFree: 3451384 kB
SwapTotal: 8388600 kB
SwapFree: 8388600 kB
Dirty: 644 kB
Writeback: 0 kB
AnonPages: 777524 kB
Mapped: 24816 kB
Slab: 557716 kB
PageTables: 16300 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 12582904 kB
Committed_AS: 1624128 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 4556 kB
VmallocChunk: 34359733771 kB
===========================================================

Can any one provide any insights into a possible solution of this issue.

--
Kind Regards,
Sherin

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