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252 • Linux Symposium 2004 • Volume One gsyprf3:~# q-view .q/kernel-cpu0.info | more Flat profile of CPU_CYCLES in kernel-cpu0.hist#0: Each histogram sample counts as 200.510u seconds % time self cumul calls self/call tot/call name 68.88 13.41 13.41 215k 62.5u 62.5u default_idle 2.90 0.56 13.97 431k 1.31u 1.31u finish_task_switch 2.50 0.49 14.46 233k 2.09u 4.89u tg3_poll 1.77 0.35 14.80 1.38M 251n 268n ipt_do_table 1.61 0.31 15.12 240k 1.31u 1.31u tg3_interrupt 1.51 0.29 15.41 240k 1.22u 5.95u net_rx_action . . . Call-graph table: index %time self children called name [176] 69.4 30.5m 13.4 - cpu_idle 29.5m 0.285 231k/457k schedule [164] 10.0m 0.00 244k/244k check_pgt_cache [178] 13.4 0.00 215k/215k default_idle [177] ---------------------------------------------------- . . . ---------------------------------------------------- 0.293 1.14 240k __do_softirq [40] [56] 7.4 0.293 1.14 240k net_rx_action 0.487 0.649 233k/233k tg3_poll [57] ---------------------------------------------------- 0.487 0.649 233k net_rx_action [56] [57] 5.9 0.487 0.649 233k tg3_poll - 0.00 229k/229k tg3_enable_ints [133] 97.7m 0.552 225k/225k tg3_rx [61] - 0.00 227k/227k tg3_tx [58] ---------------------------------------------------- . . . ---------------------------------------------------- - 1.88 348k ia64_leave_kernel [10] [11] 9.7 - 1.88 348k ia64_handle_irq - 1.52 239k/240k do_softirq [39] - 0.367 356k/356k do_IRQ [12] ---------------------------------------------------- . . . Figure 10: q-view output for TCP_RR over tg3 v3.6
Linux Symposium 2004 • Volume One • 253 fore going through the rest of the output. 6 Conclusion 6.1 More pfmon examples CPU L2 cache misses in one kernel function pfmon --verb -k \ --irange=sba_alloc_range \ -el2_misses --system-wide \ --session-timeout=10 Show all L2 cache misses in sba_alloc_range. This is interesting since sba_alloc_range() walks a bitmap to look for “free” resources. One can instead specify -el3_misses since L3 cache misses are much more expensive. CPU 1 memory loads pfmon --us-c \ --cpu-list=1 \ -e loads_retired \ -k --system-wide \ -- /tmp/pktgen-single Only count memory loads on CPU 1. This is useful for when we can bind the interrupt to CPU 1 and the workload to a different CPU. This lets us separate interrupt path from base level code, i.e., when is the load happening (before or after DMA occurred) and which code path should one be looking more closely at. List EAR events supported pfmon -lear List all EAR types supported by pfmon 4 . More info on Event pfmon -i DATA_EAR_ TLB_ALL pfmon can provide more info on particular events it supports. 4 EAR isn’t supported until pfmon v3.1 6.2 And thanks to. . . Special thanks to Stephane Eranian [2] for dedicating so much time to the perfmon kernel driver and associated tools. People might think the PMU does it all—but only with a lot of SW driving it. His review of this paper caught some good bloopers. This talk only happened because I sit across the aisle from him and could pester him regularly. Thanks to David Mosberger[5] for putting together q-tools and making it so trivial to use. In addition, in no particular order: Christophe de Dinechin, Bjorn Helgaas, Matthew Wilcox, Andrew Patterson, Al Stone, Asit Mallick, and James Bottomley for reviewing this document or providing technical guidance. Thanks also to the OLS staff for making this event happen every year. My apologies if I omitted other contributors. References [1] perfmon homepage, http://www.hpl.hp.com/ research/linux/ perfmon/ [2] Stephane Eranian, http://www.gelato.org/ community/gelato_ meeting.php?id=CU2004# talk22 [3] The IA-32 Intel(R) Architecture Software Developer’s Manuals, http://www.intel.com/ design/pentium4/ manuals/253668.htm [4] q-tools homepage, http://www.hpl.hp.com/
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Proceedings of the Linux Symposium
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The State of ACPI in the Linux Kern
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Conference Organizers Andrew J. Hut
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TCP Connection Passing Werner Almes
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Linux Symposium 2004 • Volume One
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Cooperative Linux Dan Aloni da-x@co
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Linux Block IO—present and future
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Linux AIO Performance and Robustnes
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Linux on NUMA Systems Martin J. Bli
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Improving Kernel Performance by Unm
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Linux Virtualization on IBM POWER5
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The State of ACPI in the Linux Kern
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