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[Xen-users] Xen 3.1 Performance

To: Xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Xen 3.1 Performance
From: Michael Watters <michael@xxxxxxxxxx>
Date: Fri, 18 May 2007 21:29:30 -0400
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Has anybody else noticed that dom0 runs a lot worse under Xen 3.1? With 3.0.4 my load average on dom0 was 0, now it's 10 with all of my domUs running. It seems like the qemu-dm processes is what's causing the load.

Here's my current system load.

xentop - 21:03:18   Xen 3.1.0
9 domains: 1 running, 8 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 4192892k total, 4084184k used, 108708k free    CPUs: 4 @ 1995MHz
NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS VBD_OO VBD_RD VBD_WR SSID Domain-0 -----r 485 23.1 504288 12.0 no limit n/a 4 4 1932 1803 0 0 0 0 0


top - 21:03:55 up 54 min,  6 users,  load average: 7.31, 8.10, 6.02
Tasks: 150 total,   2 running, 148 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.3% us,  2.0% sy,  0.0% ni, 73.4% id, 24.2% wa,  0.0% hi,  0.0% si
Mem:    504484k total,   500448k used,     4036k free,     6040k buffers
Swap:  4192956k total,      720k used,  4192236k free,   333640k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 17582 root 15 0 86476 12m 5868 S 6 2.5 0:29.06 /usr/lib/xen/bin/qemu-dm -d 9 -vcpus 1 -boot c -acpi -usb -usbdevice tablet -domain-name plesktest.watte 14033 root 15 0 98664 3316 1280 S 4 0.7 0:31.11 /usr/lib/xen/bin/qemu-dm -d 3 -vcpus 1 -boot c -acpi -usb -usbdevice tablet -domain-name host4.thegbox.c

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