I''ve been trying to use xen in a pretty specific application and was
wondering why during high I/O in a domU does the dom0 also work just
as hard, it seems the block backend devices are working the hardest on
the dom0. The setup is physical device shared to the domU not a loop
back. Is there any documentation on specifically how the backend block
device driver works?
=== top output == PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
6408 root 10 -5 0 0 0 S 2.7 0.0 0:27.59
blkback.2.hda1
6933 root 10 -5 0 0 0 S 2.3 0.0 0:26.12
blkback.3.hda1
7527 root 10 -5 0 0 0 S 2.0 0.0 0:23.58
blkback.4.hda1
8108 root 10 -5 0 0 0 S 2.0 0.0 0:26.06 blkback.5.hda1
In this you can see z4-8 is doing a dd to a file drive that the dom0
is giving it.
=== xm top output == NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%)
Domain-0 -----r 1135 45.7 1093616 10.4 1179648 11.3
z4-1 --b--- 221 0.3 1048576 10.0 1048576 10.0
z4-2 -----r 192 10.0 1048576 10.0 1048576 10.0
z4-3 --b--- 178 10.0 1048576 10.0 1048576 10.0
z4-4 --b--- 187 8.0 1048576 10.0 1048576 10.0
z4-5 --b--- 201 8.7 1048576 10.0 1048576 10.0
z4-8 ------ 104 36.6 1048576 10.0 1048576 10.0
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On 2/6/07, David Brown <dmlb2000@gmail.com> wrote:> I''ve been trying to use xen in a pretty specific application and was > wondering why during high I/O in a domU does the dom0 also work justBut really, there is no "high I/O in a domU", right? It''s virtual. jerry -- "Pay no attention to that man behind the curtain!" _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users