Re: [Xen-users] Poor network performance on Dom0 [2.6.18-6-xen-amd64]

[Imre Oolberg <imre@xxxxxxxxxxx>]

Hi!

If it helps but i found out which driver is associated with my p/ethx 
devices running ethtool like this
aix:~# ethtool -i peth1
driver: r8169
version: 2.2LK-NAPI
firmware-version:
bus-info: 0000:06:09.0

And to make sure wrong driver isnt getting in the way i sometimes just 
removed it from module tree under /lib/modules/... (or ramdisk i.e. 
initrd image) though there is obviously more appropriate way doing it.
I also run the same software and only thing which made it unstable was 
having multiple cpu's in dom0 but it is know fact and workaround is to 
have in /etc/xen/xend-config.sxp
# In SMP system, dom0 will use dom0-cpus # of CPUS
# If dom0-cpus = 0, dom0 will take all cpus available
(dom0-cpus 1)


Best regards,

Imre



Alejandro Martini wrote:
> Randall, thank you for sharing those tips. The network card was working 
> fine on this system before installing Xen. At least i've never noticed 
> any problems like the ones i reported while i was setting up the base 
> system (Debian Etch, via netinstall).
> Now i think that the problem might be related to the fact that Xen is 
> not loading the right module for this network adapter. I've googled 
> around quite a bit, but wasn't able to find a conclusive statement on 
> what kind of card this is.
> There are at least three possibilities, since:
>
> - The manufacturer states that this is a Realtek RTL8111B (the 
> motherboard is an ASRock AliveNF5-eSATAII)
> - lspci identifies it as "Realtek Semiconductor Co., Ltd. RTL8111/8168B 
> PCI Express Gigabit Ethernet controller"
> - udev seems to have detected it as 8169
> - Xen loads the r8169 module for this card, even if r8168.ko is present 
> and r8169 is blacklisted.
> So, i cannot tell for sure if i'm dealing with an 8169, an 8168B or an 
> 8111B.
> If i run modinfo, i can see that both modules (r8168 and r8169) have 
> matching aliases for this card type (10ec:8168), and then i don't really 
> know how the kernel decides which module to load, or how to tell it to 
> choose one over the other.
> With regard to your other advice (installing irqbalance), the latest 
> known version for debian/stable is 0.12-7. I guess that it's pretty 
> outdated. Anyway, if you think that it's worth trying, i'll install it 
> and see what happens.
>
> Thanks again!,
> Alex
>  
> 2008/6/23 randall ehren <randall@xxxxxxxxxxxxx 
> <mailto:randall@xxxxxxxxxxxxx>>:
>  >
>  > two things i can think of:
>  >
>  >  1) did you ever test this machine's networking performance before 
> installing xen?
>  >
>  >  2) have you tried installed 'irqbalance'? i've had to install that 
> on dell 2650's running xen 3.0.x
>  >
>  > -randall
>
>
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