Re: Low performance and some problem with kernel 2.6.32.13 and xen 4.0-rc1

[Fantu <fantonifabio@tiscali.it>]

Now i have update kernel to last of xen/stable2.6.32.x
DomU disk is with blktap2 (tap2:aio)
13 domU hvm (windows xp with gplpv 0.11.213) running
dom0 ram decrease to 1.5 gb:
------------------------
#free
             total       used       free     shared    buffers     cached
Mem:       1563136    1485024      78112          0      35960    1155452
-/+ buffers/cache:     293612    1269524
Swap:      2097144          0    2097144
------------------------
Some error show on boot mainly about ioapic and acpi, here dmesg: 
http://old.nabble.com/file/p28765188/dmesg dmesg 
What these messagges are related to? Kernel, xen or bios?



Pasi Kärkkäinen wrote:
> 
> On Fri, May 28, 2010 at 02:45:04AM -0700, Fantu wrote:
>> 
>> Server is Dell T610 with last bios (2.0.13)
>> Dom0: Lenny 64 bit, kernel 2.6.32.13, xen 4.0-rc1
>> Kernel is last commit of jeremy git xen/stable-2.6.32.x with this config: 
>> http://old.nabble.com/file/p28704783/config-2.6.32.13 config-2.6.32.13 
>> lspci -vvv:  http://old.nabble.com/file/p28704783/lspcivvv.log
>> lspcivvv.log 
>> dmidecode:  http://old.nabble.com/file/p28704783/dmidecode.log
>> dmidecode.log 
>> dmesg:  http://old.nabble.com/file/p28704783/dmesg dmesg 
>> lsmod:  http://old.nabble.com/file/p28704783/lsmod.log lsmod.log 
>> xend log:  http://old.nabble.com/file/p28704783/xend.log xend.log 
>> menu.lst:
>> title           Xen 4 / Debian GNU/Linux, kernel 2.6.32.13
>> root            (hd0,0)
>> kernel          /boot/xen.gz dom0_mem=2560M
>> module          /boot/vmlinuz-2.6.32.13 root=LABEL=root-backup2 ro
>> nomodeset
>> module          /boot/initrd.img-2.6.32.13
>> 
>> The server run 12 domU windows xp with gplpv 0.11.0.213, all work
>> On dom0 blktap not work (write about in other topic) and i must chage
>> domU
>> disk from tap:aio to file, is one or the problem about performance?
>> With not set of dom0 memory and dom0 balloning have "freeze" with last
>> msg
>> calltrace about out of memory, i set dom0 memory in menu.lst and disable
>> dom0 balloning, is necessary more ram that 2.5gb for dom0?
>>
> 
> You really don't need 2,5 GB for dom0.
> Start with 1024 MB. You might be able to go down to 512 MB or so.
> 
> It really depends what kind of tools you run in dom0.
> 
> Also remember that file: driver for guest disks uses dom0 page cache,
> so it may appear that a lot of dom0 memory is used when using file: driver
> since dom0 page cache will use *all* the free memory.. so increasing 
> dom0 memory just makes you use more of the memory as cache.
> 
> You really should get tap:aio: working instead. But I guess you open
> another
> thread about it.
> 
>> There are some option in .config of kernel wrong or not good?
>> with c state option in bios enable system is inusable, now i disable it
>> but
>> this is kernel, xen or bios problem?
>> 
>> I hope this information helps improve the kernel and xen, tell me if need
>> another information
>> 
>> Thanks for any reply about my questions
>> 
> 
> -- Pasi
> 
> 
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> 
> 

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