I haven't worked with xen in a few months, but I'd highly suggest looking at the xen host server itself instead of the vps. Setup some sort of monitoring on the VPS, coordinate the time it looses internet connection to the host server logs, maybe it'll provide some insight. Unless, its this VPS. Was this built off of XEN's templates or a P2V system?<br>
<br><div class="gmail_quote">On Thu, Sep 1, 2011 at 12:36 AM, Sherin George <span dir="ltr"><<a href="mailto:list@sheringeorge.co.cc">list@sheringeorge.co.cc</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi,<br>
<br>
I have a centos 5.6 xen vps which loses network connectivity once in a<br>
while with following error.<br>
<br>
=========================================<br>
-bash-3.2# ping 8.8.8.8<br>
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.<br>
ping: sendmsg: No buffer space available<br>
ping: sendmsg: No buffer space available<br>
ping: sendmsg: No buffer space available<br>
ping: sendmsg: No buffer space available<br>
=========================================<br>
<br>
All my investigation so far led me to believe that it is because<br>
skbuff cache getting full.<br>
<br>
=========================================================================<br>
<br>
PROC-SLABINFO<br>
skbuff_fclone_cache 227 308 512 7 1 : tunables 54<br>
27 8 : slabdata 44 44 0<br>
skbuff_head_cache 1574 1650 256 15 1 : tunables 120 60<br>
8 : slabdata 110 110 0<br>
<br>
SLAB-TOP<br>
Active / Total Objects (% used) : 2140910 / 2200115 (97.3%)<br>
Active / Total Slabs (% used) : 139160 / 139182 (100.0%)<br>
Active / Total Caches (% used) : 88 / 136 (64.7%)<br>
Active / Total Size (% used) : 512788.94K / 520252.14K (98.6%)<br>
Minimum / Average / Maximum Object : 0.02K / 0.24K / 128.00K<br>
<br>
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME<br>
664000 620290 93% 0.09K 16600 40 66400K buffer_head<br>
409950 408396 99% 0.21K 22775 18 91100K dentry_cache<br>
343056 340307 99% 0.08K 7147 48 28588K selinux_inode_security<br>
338590 336756 99% 0.74K 67718 5 270872K ext3_inode_cache<br>
143665 143363 99% 0.06K 2435 59 9740K size-64<br>
99540 99407 99% 0.25K 6636 15 26544K size-256<br>
96450 96447 99% 0.12K 3215 30 12860K size-128<br>
60858 60858 100% 0.52K 8694 7 34776K radix_tree_node<br>
12420 11088 89% 0.16K 540 23 2160K vm_area_struct<br>
5895 4185 70% 0.25K 393 15 1572K filp<br>
4816 3355 69% 0.03K 43 112 172K size-32<br>
2904 2810 96% 0.09K 66 44 264K sysfs_dir_cache<br>
2058 1937 94% 0.58K 343 6 1372K proc_inode_cache<br>
1728 1215 70% 0.02K 12 144 48K anon_vma<br>
1650 1590 96% 0.25K 110 15 440K skbuff_head_cache<br>
1498 1493 99% 2.00K 749 2 2996K size-2048<br>
1050 1032 98% 0.55K 150 7 600K inode_cache<br>
792 767 96% 1.00K 198 4 792K size-1024<br>
649 298 45% 0.06K 11 59 44K pid<br>
600 227 37% 0.09K 15 40 60K journal_head<br>
590 298 50% 0.06K 10 59 40K delayacct_cache<br>
496 424 85% 0.50K 62 8 248K size-512<br>
413 156 37% 0.06K 7 59 28K fs_cache<br>
404 44 10% 0.02K 2 202 8K biovec-1<br>
390 293 75% 0.12K 13 30 52K bio<br>
327 327 100% 4.00K 327 1 1308K size-4096<br>
320 190 59% 0.38K 32 10 128K ip_dst_cache<br>
308 227 73% 0.50K 44 7 176K skbuff_fclone_cache<br>
258 247 95% 0.62K 43 6 172K sock_inode_cache<br>
254 254 100% 1.84K 127 2 508K task_struct<br>
252 225 89% 0.81K 28 9 224K signal_cache<br>
240 203 84% 0.73K 48 5 192K shmem_inode_cache<br>
204 204 100% 2.06K 68 3 544K sighand_cache<br>
202 4 1% 0.02K 1 202 4K revoke_table<br>
195 194 99% 0.75K 39 5 156K UDP<br>
159 77 48% 0.07K 3 53 12K eventpoll_pwq<br>
145 139 95% 0.75K 29 5 116K files_cache<br>
144 41 28% 0.02K 1 144 4K journal_handle<br>
140 140 100% 0.88K 35 4 140K mm_struct<br>
140 77 55% 0.19K 7 20 28K eventpoll_epi<br>
135 135 100% 2.12K 135 1 540K kmem_cache<br>
121 45 37% 0.69K 11 11 88K UNIX<br>
119 114 95% 0.52K 17 7 68K idr_layer_cache<br>
118 41 34% 0.06K 2 59 8K blkdev_ioc<br>
112 32 28% 0.03K 1 112 4K tcp_bind_bucket<br>
110 56 50% 0.17K 5 22 20K file_lock_cache<br>
106 35 33% 0.07K 2 53 8K avc_node<br>
105 98 93% 1.50K 21 5 168K TCP<br>
105 100 95% 1.04K 15 7 120K bio_map_info<br>
92 1 1% 0.04K 1 92 4K dnotify_cache<br>
80 18 22% 0.19K 4 20 16K tw_sock_TCP<br>
70 44 62% 0.27K 5 14 20K blkdev_requests<br>
59 23 38% 0.06K 1 59 4K biovec-4<br>
59 13 22% 0.06K 1 59 4K fib6_nodes<br>
59 11 18% 0.06K 1 59 4K ip_fib_hash<br>
59 11 18% 0.06K 1 59 4K ip_fib_alias<br>
53 53 100% 0.07K 1 53 4K taskstats_cache<br>
53 1 1% 0.07K 1 53 4K inotify_watch_cache<br>
48 48 100% 0.16K 2 24 8K sigqueue<br>
48 8 16% 0.08K 1 48 4K crq_pool<br>
45 27 60% 0.25K 3 15 12K mnt_cache<br>
45 29 64% 0.25K 3 15 12K dquot<br>
45 32 71% 0.25K 3 15 12K sgpool-8<br>
40 19 47% 0.19K 2 20 8K key_jar<br>
32 32 100% 0.50K 4 8 16K sgpool-16<br>
32 32 100% 1.00K 8 4 32K sgpool-32<br>
32 32 100% 2.00K 16 2 64K sgpool-64<br>
32 32 100% 4.00K 32 1 128K sgpool-128<br>
31 31 100% 8.00K 31 1 248K size-8192<br>
30 27 90% 1.54K 6 5 48K blkdev_queue<br>
30 14 46% 0.12K 1 30 4K request_sock_TCP<br>
30 3 10% 0.12K 1 30 4K inet_peer_cache<br>
<br>
FREE-M<br>
total used free shared buffers cached<br>
Mem: 8192 4821 3370 0 500 2793<br>
-/+ buffers/cache: 1527 6664<br>
Swap: 8191 0 8191<br>
<br>
PROC-MEMINFO<br>
MemTotal: 8388608 kB<br>
MemFree: 3451384 kB<br>
Buffers: 512352 kB<br>
Cached: 2860580 kB<br>
SwapCached: 0 kB<br>
Active: 2971812 kB<br>
Inactive: 1178908 kB<br>
HighTotal: 0 kB<br>
HighFree: 0 kB<br>
LowTotal: 8388608 kB<br>
LowFree: 3451384 kB<br>
SwapTotal: 8388600 kB<br>
SwapFree: 8388600 kB<br>
Dirty: 644 kB<br>
Writeback: 0 kB<br>
AnonPages: 777524 kB<br>
Mapped: 24816 kB<br>
Slab: 557716 kB<br>
PageTables: 16300 kB<br>
NFS_Unstable: 0 kB<br>
Bounce: 0 kB<br>
CommitLimit: 12582904 kB<br>
Committed_AS: 1624128 kB<br>
VmallocTotal: 34359738367 kB<br>
VmallocUsed: 4556 kB<br>
VmallocChunk: 34359733771 kB<br>
===========================================================<br>
<br>
Can any one provide any insights into a possible solution of this issue.<br>
<font color="#888888"><br>
--<br>
Kind Regards,<br>
Sherin<br>
_______________________________________________<br>
CentOS mailing list<br>
<a href="mailto:CentOS@centos.org">CentOS@centos.org</a><br>
<a href="http://lists.centos.org/mailman/listinfo/centos" target="_blank">http://lists.centos.org/mailman/listinfo/centos</a><br>
</font></blockquote></div><br>