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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