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Message-ID: <50F4C8AB.6050902@linux.vnet.ibm.com> Date: Tue, 15 Jan 2013 11:10:35 +0800 From: Michael Wang <wangyun@...ux.vnet.ibm.com> To: Mike Galbraith <bitbucket@...ine.de> CC: linux-kernel@...r.kernel.org, mingo@...hat.com, peterz@...radead.org, mingo@...nel.org, a.p.zijlstra@...llo.nl Subject: Re: [RFC PATCH 0/2] sched: simplify the select_task_rq_fair() On 01/14/2013 05:21 PM, Mike Galbraith wrote: > On Sat, 2013-01-12 at 11:19 +0100, Mike Galbraith wrote: > >> Hm, low end takes a big hit. > > Bah, that's perturbations and knobs. > > aim7 compute, three individual runs + average > > Stock scheduler knobs.. > > 3.8-wang avg 3.8-virgin avg vs wang > Tasks jobs/min jobs/min jobs/min > 1 435.97 433.48 433.48 434.31 436.91 436.60 434.41 435.97 1.003 > 5 2108.56 2120.36 2153.52 2127.48 2239.47 2257.82 2285.07 2260.78 1.062 > 10 4205.41 4167.81 4294.83 4222.68 4223.00 4199.58 4252.63 4225.07 1.000 > 20 8511.24 8434.24 8614.07 8519.85 8523.21 8505.26 8931.47 8653.31 1.015 > 40 13209.81 6389.04 5308.80 8302.55 13011.27 13131.09 13788.40 13310.25 1.603 > 80 12239.33 17797.36 20438.45 16825.04 15380.71 14372.96 14080.74 13921.31 .827 > 160 52638.44 52609.88 37364.16 47537.49 26644.68 44826.63 41703.23 37724.84 .793 > 320 105162.69 111512.36 105909.34 107528.13 102386.48 106141.22 103424.00 103983.90 .967 > 640 207290.22 207623.13 204556.96 206490.10 196673.43 193243.65 190210.89 193375.99 .936 > 1280 329795.92 326739.68 328399.66 328311.75 305867.51 307931.72 305988.17 306595.80 .933 > 2560 414580.44 418156.33 413035.14 415257.30 404000.00 403894.82 402428.02 403440.94 .971 > > Twiddled knobs.. > sched_latency_ns = 24ms > sched_min_granularity_ns = 8ms > sched_wakeup_granularity_ns = 10ms > > 3.8-wang avg 3.8-virgin avg vs wang > Tasks jobs/min jobs/min jobs/min > 1 437.23 437.23 436.91 437.12 437.86 439.45 438.18 438.49 1.003 > 5 2102.71 2121.85 2130.80 2118.45 2223.04 2165.83 2314.74 2234.53 1.054 > 10 4282.69 4252.63 4378.61 4304.64 4310.10 4303.98 4310.10 4308.06 1.000 > 20 8675.73 8650.96 8725.70 8684.13 8595.74 8638.63 8725.70 8653.35 .996 > 40 16546.08 16512.26 16546.08 16534.80 17022.47 16798.34 16717.24 16846.01 1.018 > 80 32712.55 32602.56 32493.30 32602.80 33137.39 33137.39 32890.09 33054.95 1.013 > 160 63372.55 63125.00 63663.82 63387.12 64510.98 64382.47 64084.60 64326.01 1.014 > 320 121885.61 122656.55 121503.76 122015.30 121124.30 121885.61 121732.58 121580.83 .996 > 640 218010.12 216066.85 217034.14 217037.03 213450.74 212864.98 212282.43 212866.05 .980 > 1280 332339.33 332197.00 332624.36 332386.89 325915.97 325505.67 325232.70 325551.44 .979 > 2560 426901.49 426666.67 427254.20 426940.78 424448.70 425263.16 424564.86 424758.90 .994 > > Much better, ~no difference between kernels for this load. Thanks for the testing, could you please tell me which benchmark generate these results? I will try to re-base the patch into 3.8-rc3 with consideration of NUMA domain, I suppose it could fix the below BUG and provide a better results. Regards, Michael Wang > > Except patched 3.8-rc3 kernel crashes on reboot. > > Please stand by while rebooting the system... > [ 123.104064] kvm: exiting hardware virtualization > [ 123.302908] Disabling[ 124.729877] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040 > [ 124.758804] IP: [<ffffffff810821f6>] wake_affine+0x26/0x2f0 > [ 124.785634] PGD e7089b067 PUD e736f7067 PMD 0 > [ 124.810176] Oops: 0000 [#1] SMP > [ 124.829767] Modules linked in: iptable_filter ip_tables x_tables nfsv3 nfs_acl nfs fscache lockd sunrpc autofs4 edd af_packet cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf fuse loop dm_mod coretemp kvm_intel iTCO_wdt kvm iTCO_vendor_support i7core_edac igb ioatdma lpc_ich tpm_tis ptp crc32c_intel ipv6 joydev edac_core mfd_core pps_core dca microcode tpm hid_generic i2c_i801 tpm_bios ehci_pci acpi_memhotplug sr_mod container pcspkr sg cdrom button rtc_cmos ext3 jbd mbcache mgag200 ttm drm_kms_helper drm i2c_algo_bit sysimgblt sysfillrect i2c_core syscopyarea usbhid hid uhci_hcd ehci_hcd usbcore usb_common sd_mod crc_t10dif processor thermal_sys hwmon scsi_dh_alua scsi_dh_rdac scsi_dh_hp_sw scsi_dh_emc scsi_dh ata_generic ata_piix libata megaraid_sas scsi_mod > [ 125.093116] CPU 36 > [ 125.097498] Pid: 0, comm: swapper/36 Not tainted 3.8.0-wang #58 QCI QSSC-S4R/QSSC-S4R > [ 125.148934] RIP: 0010:[<ffffffff810821f6>] [<ffffffff810821f6>] wake_affine+0x26/0x2f0 > [ 125.183856] RSP: 0018:ffff88046d9dfc70 EFLAGS: 00010082 > [ 125.213390] RAX: 0000000000000001 RBX: 0000000000000024 RCX: 0000000000000046 > [ 125.247203] RDX: 0000000000000000 RSI: ffff88046d946280 RDI: 0000000000000000 > [ 125.280734] RBP: ffff88046d9dfce8 R08: 0000000000000000 R09: 0000000000000000 > [ 125.317137] R10: 0000000000000000 R11: 0000000000000001 R12: ffff88046fa53980 > [ 125.354487] R13: 0000000000000024 R14: 0000000000000006 R15: ffff88046d946280 > [ 125.391549] FS: 0000000000000000(0000) GS:ffff88046fa40000(0000) knlGS:0000000000000000 > [ 125.431203] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 125.465018] CR2: 0000000000000040 CR3: 0000000e712a1000 CR4: 00000000000007e0 > [ 125.501827] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 125.536604] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > [ 125.570415] Process swapper/36 (pid: 0, threadinfo ffff88046d9de000, task ffff88046d9dc580) > [ 125.606630] Stack: > [ 125.629700] ffffffff810895d9 ffff88046d9dfc88 ffff88046fc52f70 000000006d9462c8 > [ 125.664431] 0000000000000000 ffff88046d9dfcc8 ffffffff8108a004 ffff88046d9dfce8 > [ 125.699339] ffffffff81086134 000000246d9dfcd8 0000000000000024 ffff88046fa53980 > [ 125.734981] Call Trace: > [ 125.758061] [<ffffffff810895d9>] ? enqueue_entity+0x229/0xa40 > [ 125.790423] [<ffffffff8108a004>] ? enqueue_task_fair+0x214/0x560 > [ 125.823023] [<ffffffff81086134>] ? select_idle_sibling+0xf4/0x120 > [ 125.856434] [<ffffffff810863a9>] select_task_rq_fair+0x249/0x280 > [ 125.892564] [<ffffffff8102d056>] ? native_apic_msr_write+0x36/0x40 > [ 125.925262] [<ffffffff8107fbbb>] try_to_wake_up+0x12b/0x2b0 > [ 125.956939] [<ffffffff8107fd4d>] default_wake_function+0xd/0x10 > [ 125.989521] [<ffffffff8106d031>] autoremove_wake_function+0x11/0x40 > [ 126.022899] [<ffffffff81075e1a>] __wake_up_common+0x5a/0x90 > [ 126.054874] [<ffffffff810794a3>] __wake_up+0x43/0x70 > [ 126.085086] [<ffffffff810e2869>] force_quiescent_state+0xe9/0x130 > [ 126.117469] [<ffffffff810e420e>] rcu_prepare_for_idle+0x27e/0x480 > [ 126.150317] [<ffffffff810e444d>] rcu_eqs_enter_common+0x3d/0x100 > [ 126.182428] [<ffffffff810e4642>] rcu_idle_enter+0x92/0xe0 > [ 126.213041] [<ffffffff8100abd8>] cpu_idle+0x78/0xd0 > [ 126.242939] [<ffffffff8149bcce>] start_secondary+0x7a/0x7c > [ 126.273874] Code: 00 00 00 00 00 55 48 89 e5 48 83 ec 78 4c 89 7d f8 89 55 a4 49 89 f7 48 89 5d d8 4c 89 65 e0 4c 89 6d e8 4c 89 75 f0 48 89 7d a8 <8b> 47 40 65 44 8b 04 25 20 b0 00 00 89 45 c8 48 8b 46 08 48 c7 > [ 126.358480] RIP [<ffffine+0x26/0x2f0[ 126.392023] RSP <ffff88046d9dfc70> > [ 126.422108] CR2: 0000000000000040 > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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