Re: [Xen-users] DomU IO issue

[SZABO Zsolt <szazs@xxxxxxxxx>]

I also have strange IO problem, though not sure if it is the problem 
of the driver of the adapter or of other...
I would use md RAID1 devices and lvm on the top of them... and now the 
question is the filesystem: ext3, reiserfs or xfs or else?
I have an inherited system with reiserfs on the lvm partitions above the 
md devices both in dom0 and domU-s. I also have a separate xensave 
lvm partition but with xfs... The xm save command for a domU with 4-6G mem
sometimes takes 8-10 min! Though I use it not frequently and therefore I 
did not do much investigation about it....
It is likely that the IO operations are also influenced whether the dom0 
has a dedicated core or not...
Are there docs or howtos about these (optimal CPU setup, partitioning and 
fs choosing) or benchmarks? I am not an expert and I am even not sure what 
should be an appropriate test procedure...
Currently I use debian-etch and xen-3.2.1 with 2.6.18 kernel

--
Zsolt
As probably Fajar has suggested, I have:

(XEN) Command line: console=vga vga=gfx-1024x768x8 dom0_mem=512M 
dom0_vcpus_pin apic_verbosity=debug cpufreq=dom0-kernel acpi=on numa=on
in xend-config.sxp:
(dom0-min-mem 196)
(dom0-cpus 1)

xm list:
Name                                   ID   Mem VCPUs      State   Time(s)
Domain-0                                0   512     1     r-----  14695.7
cosmos                                  1   512     1     -b----   4275.0
xp_hvm                                  2   512     1     r----- 287362.6
linserver                               3  6144     4     -b----   3366.1
w2003_hvm                               6  6144     4     ------   4805.5

xm vcpu-list
Name                                ID  VCPU   CPU State   Time(s) CPU Aff.
Domain-0                             0     0     0   r--   14684.9 0
Domain-0                             0     1     -   --p       1.8 1
Domain-0                             0     2     -   --p       1.8 2
Domain-0                             0     3     -   --p       1.3 3
Domain-0                             0     4     -   --p       1.1 4
Domain-0                             0     5     -   --p       1.5 5
Domain-0                             0     6     -   --p       1.9 6
Domain-0                             0     7     -   --p       2.9 7
cosmos                               1     0     1   -b-    4276.2 any cpu
xp_hvm                               2     0     3   r--  287397.8 3-4
linserver                            3     0     5   -b-    2482.6 any cpu
linserver                            3     1     5   -b-     182.0 any cpu
linserver                            3     2     4   -b-     423.7 any cpu
linserver                            3     3     2   -b-     277.8 any cpu
w2003_hvm                            6     0     6   -b-    1120.6 4-7
w2003_hvm                            6     1     7   -b-     507.5 4-7
w2003_hvm                            6     2     4   -b-    2617.5 4-7
w2003_hvm                            6     3     5   -b-     560.8 4-7

(cosmos and linserver got "any cpu" after xm restore... before xm save 
they had 3-4 and 1-3,5... but I am not really sure what woulde be the 
optimal config: cosmos and xp_hvm have not much load, linserver and 
w2003_hvm serve a 15-20 client classroom but the terminals usually have 
either linux only or windows rdesktop only sessions...)
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