Re: [Xen-devel] Xen cluster n/w performance

[David Becker <becker@xxxxxxxxxxx>]

I changed RX_MIN_TARGET in
linux-2.4.27-xenU/arch/xen/drivers/netif/frontend/main.c
and it made no difference at all in the 1500 byte iperf test.

" the number of interrupts per second reported by the dom0 and domU
" in each configuration.



For iperf tcp stream sent from stock linux to xenU
(2.4.27-xenU+RX_MIN_TARGET mod)


    1500 MTU: 464 Mbps

interrupts per second seen on xen0:
irq  1:         0 Phys-irq  keyboard    irq129:         0 Dynamic-irq  ctrl-if 
irq 14:         0 Phys-irq  ide0        irq130:      7473 Dynamic-irq  timer   
irq 17:     28526 Phys-irq  eth0        irq131:         0 Dynamic-irq  timer_d 
irq 18:        15 Phys-irq  aic7xxx     irq132:         0 Dynamic-irq  console 
irq 19:         0 Phys-irq  aic7xxx     irq133:         0 Dynamic-irq  blkif-b 
irq128:         0 Dynamic-irq  misdire  irq134:      1464 Dynamic-irq  vif3.0  

interrupts per second seen on xenU:
irq128:         0 Dynamic-irq  misdire  irq131:         0 Dynamic-irq  timer_d  
irq129:         0 Dynamic-irq  ctrl-if  irq132:         0 Dynamic-irq  blkif   
irq130:      5273 Dynamic-irq  timer    irq133:      5121 Dynamic-irq  eth0    


    552 MTU: 230 Mbps

interrupts per second seen on xen0:
irq  1:         0 Phys-irq  keyboard    irq129:         0 Dynamic-irq  ctrl-if 
irq 14:         0 Phys-irq  ide0        irq130:      9103 Dynamic-irq  timer   
irq 17:     19227 Phys-irq  eth0        irq131:         0 Dynamic-irq  timer_d 
irq 18:        10 Phys-irq  aic7xxx     irq132:         0 Dynamic-irq  console 
irq 19:         0 Phys-irq  aic7xxx     irq133:         0 Dynamic-irq  blkif-b 
irq128:         0 Dynamic-irq  misdire  irq134:      1804 Dynamic-irq  vif3.0  

interrupts per second seen on xenU:
irq128:         0 Dynamic-irq  misdire  irq131:         0 Dynamic-irq  timer_d 
irq129:         0 Dynamic-irq  ctrl-if  irq132:         0 Dynamic-irq  blkif   
irq130:      7264 Dynamic-irq  timer    irq133:      7158 Dynamic-irq  eth0    


The e1000 driver is stock, so these are with the default interrupt coalescing
settings.




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