[Qemu-devel] Network Issue with NE2k-PCI (fix?)

[Qemu-devel] Network Issue with NE2k-PCI (fix?)

[Steve Wormley]

I was having serious performance issues with Win2000 Guest and the NE2k in
qemu, things like pings of up to 16000ms lost packets, etc. I chased down
the problem and it appears that the following fix resolved the issue on my
system.

Now pings are:

151 packets transmitted, 151 packets received, 0% packet loss
round-trip min/avg/max = 2.207/17.174/195.239 ms


--- qemu/hw/i8259.c	Sun Jun 20 05:58:36 2004
+++ qemu-sw/hw/i8259.c	Wed Sep 22 10:49:17 2004
@@ -188,7 +196,11 @@
     } else {
         s->isr |= (1 << irq);
     }
+	/* We don't clear a level sensitive interrupt here */
+    if (!(s->elcr & (1 << irq))) {
     s->irr &= ~(1 << irq);
+	};
+
 }
 
 int cpu_get_pic_interrupt(CPUState *env)

Re: [Qemu-devel] Network Issue with NE2k-PCI (fix?)

[Fabrice Bellard]

Applied.

Fabrice.

Steve Wormley wrote:
> I was having serious performance issues with Win2000 Guest and the NE2k in
> qemu, things like pings of up to 16000ms lost packets, etc. I chased down
> the problem and it appears that the following fix resolved the issue on my
> system.
> 
> Now pings are:
> 
> 151 packets transmitted, 151 packets received, 0% packet loss
> round-trip min/avg/max = 2.207/17.174/195.239 ms
> 
> 
> --- qemu/hw/i8259.c	Sun Jun 20 05:58:36 2004
> +++ qemu-sw/hw/i8259.c	Wed Sep 22 10:49:17 2004
> @@ -188,7 +196,11 @@
>      } else {
>          s->isr |= (1 << irq);
>      }
> +	/* We don't clear a level sensitive interrupt here */
> +    if (!(s->elcr & (1 << irq))) {
>      s->irr &= ~(1 << irq);
> +	};
> +
>  }
>  
>  int cpu_get_pic_interrupt(CPUState *env)
> 
> 
> 
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