Messages in this thread | | | From | Robert Olsson <> | Date | Thu, 1 Apr 2004 00:36:00 +0200 | Subject | Re: route cache DoS testing and softirqs |
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Andrea Arcangeli writes:
> Maybe the problem is simply that NAPI should be tuned more aggressively, > it may have to poll for a longer time before giving up.
It cannot poll much more... 20 Million packets were injected in total there were 250 RX irq's. Most from my ssh sessions. There are some TX interrupts... it's another story
Packet flooding is just our way to generate load and kernel locking must work with and without irq's. As far as I understand the real problem is when do_softirq is run from irqexit etc.
Some thoughts...
If we tag the different do_softirq sources (look in my testpatch) we can control the softirqs better. For example; do_softirq's from irqexit etc could be given low a "max_restart" this to move processing to ksoftird maybe even dynamic.
Cheers. --ro - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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