Messages in this thread | | | Date | Wed, 8 Oct 2003 14:31:21 -0700 | From | "David S. Miller" <> | Subject | Re: NAPI Race? |
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On 08 Oct 2003 14:17:31 -0700 Marko Rauhamaa <marko@pacujo.net> wrote:
> But do_softirq() explicitly refuses to run > the same softirq right away.
Check current 2.6.x sources, it does loop a certain number of times even for the same softirq type.
> Well, it almost does. You can blast a NAPI driver with a packet flood, > and the system is happy and responsive -- no interrupts are generated, > and packets are polled by ksoftirqd. However, you can find a packet rate > that will cause the CPU to spend virtually all of its time in NAPI.
This situation can be created with non-NAPI drivers too.
Alexey is trying to explain to you what the true cause of the problem is, and it's not NAPI, it's softirq starvation. - 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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