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Date: Fri, 03 Jan 2014 12:04:43 -0800 From: Eric Dumazet <eric.dumazet@...il.com> To: Tom Herbert <therbert@...gle.com> Cc: David Miller <davem@...emloft.net>, Linux Netdev List <netdev@...r.kernel.org> Subject: Re: [PATCH] ipv4: move rt_genid to different cache line On Fri, 2014-01-03 at 10:01 -0800, Tom Herbert wrote: > It seems to me you have more of an issue with prequeue itself. Maybe > it is worth considering removing it to eliminate the disparate > behavior between read and poll+read, but then removing a long lived > optimization has is own pitfalls. The prequeue stuff made sense in the old model of a few concurrent flows and one thread per flow, where the gain was worth it. It is still interesting if you have a single flow trying to fully utilize the bandwidth of a 20Gbp or 40Gbp link (no dst false sharing in this case) Nowadays, the hit ratio of prequeue mode is almost 0 on servers where network performance of concurrent flows is an issue. https://code.google.com/p/sockperf/ is a good step using realistic benchmark, trying to mimic the behavior of current high performance programs. -- 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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