[Xen-users] HVM + 2.4.27 guest + interrupt question

[Andrew <andrew@xxxxxxxxxxx>]

Hi All,

I have had success running Debian (recent squeeze 2.6.32-5 kernel )and 
Win7 inside HVM.    I managed to image and import and run an old 
slackware image (with a 2.4.27 kernel).  The image boots, however I 
notice that when the guest system is under reasonable (but not 
excessive) load the pings skyrocket... sometimes as high as 13-20 
seconds (and the occasional dropped packet).  I am suspecting that the 
interrupts from the network interface are not being received in good 
time within the HVM.  Ping times are steady under guests with newer 
kernels (regardless of load).   I have tried multiple different nic 
drivers - all to the same outcome.
Host system is running a debian squeeze system with a updated 2.3.32-38 
xen (obviously) kernel with 16GB RAM.   It is an AMD64+ processor. Happy 
to add more information.  I am guessing I am not the first person to see 
this, so would appreciate any pointers.
Cheers,
Andrew






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