[Xen-users] Odd swap behavior

[Jack Downes <jack@xxxxxxxxxxxxxxxxxxxx>]

Hi,
I'm using XEN with gentoo base systems.  Both the domain-0's and the 
domain-X's are gentoo.
I build my gentoo systems according to a script, and they are all 
identical, save for things like hostname, IP, user content, etc.
So here's my question/problem:

I have some 10 "Regular" or conventional gentoo servers.

Then I have around 8 Xen based servers most of which have 4 domain x's 
on them.  These machine are all the same - dual pentium 4's, 2G ram,  
intel 865g chipset, big drives.
Okay, so the regular or conventional servers use ram and swap as 
expected - they allocate and deallocate swap as needed and I have 
uptimes on the order of 185day avg before I do a kernel rebuild or 
something.
On the xen machines, i HAVE TO reboot every 25 - 30 days because they 
NEVER deallocate swap usage and eventuall use 100% of the swap and also 
ram and then lock up hard if I don't reboot the machine before it gets 
there.
I can't use swapoff  and swapon again - here's the error I get:
server1 / # swapoff -a
swapoff: /dev/sda2: Cannot allocate memory



this machine, server1 has been up some 25 days now:
server1 / # w
15:25:41 up 25 days,  3:36,  1 user,  load average: 0.16, 0.13, 0.09
USER     TTY        LOGIN@   IDLE   JCPU   PCPU WHAT
root     vc/1      22Jun05  1.00s  0.04s  0.00s w

and our memory allocation is getting high:
server1 / # free -m
            total       used       free     shared    buffers     cached
Mem:           441        433          7          0         13        159
-/+ buffers/cache:        260        180
Swap:          964        582        382



I'm using xen-2.0.4 with kernel 2.6.10

Does anyone else have this issue, and what have you done to resolve it?

Thanks,
Jack


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