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Date: Fri, 04 Jan 2013 14:16:53 +0900 From: Namhyung Kim <namhyung@...nel.org> To: Eric Dumazet <erdnetdev@...il.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>, "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>, Tom Herbert <therbert@...gle.com> Subject: Re: [PATCH net-next] softirq: reduce latencies Hi, On Thu, 03 Jan 2013 14:41:15 -0800, Eric Dumazet wrote: > On Thu, 2013-01-03 at 12:46 -0800, Andrew Morton wrote: >> Can this change cause worsened latencies in some situations? Say there >> are a large number of short-running actions queued. Presently we'll >> dispatch ten of them and return. With this change we'll dispatch many >> more of them - however many consume 2ms. So worst-case latency >> increases from "10 * not-much" to "2 ms". > > I tried to reproduce such workload but couldnt. 2 ms (or more exactly 1 > to 2 ms given the jiffies/HZ granularity) is about the time needed to > process 1000 frames on current hardware. Probably a silly question: Why not using ktime rather than jiffies for this? Thanks, Namhyung -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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