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Hi there. I am looking for improving network interrupt balancing mechanism in SMP internet server. So I have analyzed kirqd in Linux kernel and I have done the following experiment to realize impact of kirqd. ------------------------------------------------------------- - Server spec. CPU: AMD Phenom 9550 Quad-Core (each core 2.2 GHz) Network card: RealTek Gigabit Ethernet Network driver: R8169 disabled NAPI - Client spec. CPU: Intel Pentium 4 CPU 3.20GHz Network card: Marvell Gigabit Ethernet - Network Connected with gigabit switch - Benchmark tool Netperf (throughput for TCP_STREAM in 10 mins) - Comparison (throughput) 1. kernel 2.6.19.2 (smp_affinity of network irq is CPU 0.) 2. kernel 2.6.19.2 enabled kirqd ------------------------------------------------------------- Experimental result present that there is no difference between 1 and 2. Both have achieved throughput of about 940 Mbps via the experiment. Throughput of 1 describes that netperf traffic can't saturate the server system and then it is normal traffic. I have thought that kirqd will - get "good" performance due to removing "receive livelock" of a CPU under high traffic. - get "poor" performance due to cache miss under low or normal traffic. But the result for normal traffic doesn't so. Is it correct? I had no idea of how to generate high traffic and couldn't perform it. How can I generate high traffic to saturate the server system? I wonder whether my experimental setup is correct or not. How do I have to configure experiment to discover a strong or weak point of kirqd? Please comment on my experiment result and setup, and tell me the web link if there are experiment materials for the system performance of kirqd regards. -- Eunsung +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+= Eunsung Kim PhD candidate Distibuted Computing System Laboratory School of Computer Science and Engineering Seoul National University Tel: +82-2-876-2159 Email: eskim@dcslab.snu.ac.kr +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+= -- 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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