Hi guys

I have am using FC11 64bit on Host and same OS on KVM based guest machine. I am using TAP based routing network inside host. I am using virtio network driver for my guest machine

When i transfer huge data via rsync from another live host my guest machine got halt with following errors in log. I need to restart network service to make guest VM back.

With 512M RAM for guest VM, it got halt for 5G data transffer via rsync
With 1G RAM  for guest VM, it got halt if  i try to shift 15G data transffer via rsync

Aug 28 12:43:08 phili-p kernel: swapper: page allocation failure. order:0, mode:0x20
Aug 28 12:43:08 phili-p kernel: Pid: 0, comm: swapper Not tainted 2.6.29.6-217.2.8.fc11.x86_64 #1
Aug 28 12:43:08 phili-p kernel: Call Trace:
Aug 28 12:43:08 phili-p kernel: <IRQ>  [<ffffffff810a50c8>] __alloc_pages_internal+0x40d/0x429
Aug 28 12:43:08 phili-p kernel: [<ffffffff810c7311>] alloc_pages_current+0xb7/0xc0
Aug 28 12:43:08 phili-p kernel: [<ffffffffa0057913>] try_fill_recv+0xa8/0x18d [virtio_net]
Aug 28 12:43:08 phili-p kernel: [<ffffffffa00584a7>] virtnet_poll+0x518/0x57d [virtio_net]
Aug 28 12:43:08 phili-p kernel: [<ffffffff8130eccd>] net_rx_action+0xb7/0x1b1
Aug 28 12:43:08 phili-p kernel: [<ffffffff8104df7f>] __do_softirq+0x94/0x155
Aug 28 12:43:08 phili-p kernel: [<ffffffff8101274c>] call_softirq+0x1c/0x30
Aug 28 12:43:08 phili-p kernel: [<ffffffff810138ce>] do_softirq+0x52/0xb9
Aug 28 12:43:08 phili-p kernel: [<ffffffff8104dba2>] irq_exit+0x53/0x90
Aug 28 12:43:08 phili-p kernel: [<ffffffff81013bf7>] do_IRQ+0x12c/0x151
Aug 28 12:43:08 phili-p kernel: [<ffffffff81011e93>] ret_from_intr+0x0/0x2e
Aug 28 12:43:08 phili-p kernel: <EOI>  [<ffffffff8102942c>] ? native_safe_halt+0xb/0xd
Aug 28 12:43:08 phili-p kernel: [<ffffffff81017d30>] ? default_idle+0x51/0x7c
Aug 28 12:43:08 phili-p kernel: [<ffffffff813af519>] ? atomic_notifier_call_chain+0x13/0x15
Aug 28 12:43:08 phili-p kernel: [<ffffffff81010237>] ? enter_idle+0x27/0x29
Aug 28 12:43:08 phili-p kernel: [<ffffffff810102a1>] ? cpu_idle+0x68/0xb3
Aug 28 12:43:08 phili-p kernel: [<ffffffff81398367>] ? rest_init+0x6b/0x6d
Aug 28 12:43:08 phili-p kernel: Mem-Info:
Aug 28 12:43:08 phili-p kernel: Node 0 DMA per-cpu:
Aug 28 12:43:08 phili-p kernel: CPU    0: hi:    0, btch:   1 usd:   0
Aug 28 12:43:08 phili-p kernel: Node 0 DMA32 per-cpu:
Aug 28 12:43:08 phili-p kernel: CPU    0: hi:  186, btch:  31 usd: 191
Aug 28 12:43:08 phili-p kernel: Active_anon:5593 active_file:26509 inactive_anon:7932
Aug 28 12:43:08 phili-p kernel: inactive_file:177229 unevictable:0 dirty:16171 writeback:52 unstable:0
Aug 28 12:43:08 phili-p kernel: free:1334 slab:10907 mapped:3728 pagetables:1340 bounce:0
Aug 28 12:43:08 phili-p kernel: Node 0 DMA free:3892kB min:24kB low:28kB high:36kB active_anon:0kB inactive_anon:0kB active_file:24kB inactive_file:4024kB unevictable:0kB present:6368kB pages_scanned:0 all_unreclaimable? no
Aug 28 12:43:08 phili-p kernel: lowmem_reserve[]: 0 970 970 970
Aug 28 12:43:08 phili-p kernel: Node 0 DMA32 free:1444kB min:3972kB low:4964kB high:5956kB active_anon:22372kB inactive_anon:31728kB active_file:106012kB inactive_file:704892kB unevictable:0kB present:993776kB pages_scanned:0 all_unreclaimable? no
Aug 28 12:43:08 phili-p kernel: lowmem_reserve[]: 0 0 0 0
Aug 28 12:43:08 phili-p kernel: Node 0 DMA: 1*4kB 0*8kB 1*16kB 1*32kB 0*64kB 0*128kB 1*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 3892kB
Aug 28 12:43:08 phili-p kernel: Node 0 DMA32: 1*4kB 0*8kB 1*16kB 0*32kB 0*64kB 1*128kB 1*256kB 0*512kB 1*1024kB 0*2048kB 0*4096kB = 1428kB
Aug 28 12:43:08 phili-p kernel: 203802 total pagecache pages
Aug 28 12:43:08 phili-p kernel: 0 pages in swap cache
Aug 28 12:43:08 phili-p kernel: Swap cache stats: add 0, delete 0, find 0/0
Aug 28 12:43:08 phili-p kernel: Free swap  = 2096440kB
Aug 28 12:43:08 phili-p kernel: Total swap = 2096440kB
Aug 28 12:43:08 phili-p kernel: 255984 pages RAM
Aug 28 12:43:08 phili-p kernel: 8458 pages reserved
Aug 28 12:43:08 phili-p kernel: 214776 pages shared
Aug 28 12:43:08 phili-p kernel: 43672 pages non-shared

Note: i want to use my VM for heavy rsync backups. Experts are request to have some solution for the problem


Regards, Mateen


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