From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756698Ab3ANJVq (ORCPT ); Mon, 14 Jan 2013 04:21:46 -0500 Received: from moutng.kundenserver.de ([212.227.126.187]:51041 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756245Ab3ANJVo (ORCPT ); Mon, 14 Jan 2013 04:21:44 -0500 Message-ID: <1358155290.5631.19.camel@marge.simpson.net> Subject: Re: [RFC PATCH 0/2] sched: simplify the select_task_rq_fair() From: Mike Galbraith To: Michael Wang Cc: linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, mingo@kernel.org, a.p.zijlstra@chello.nl Date: Mon, 14 Jan 2013 10:21:30 +0100 In-Reply-To: <1357985943.6796.55.camel@marge.simpson.net> References: <1356588535-23251-1-git-send-email-wangyun@linux.vnet.ibm.com> <50ED384C.1030301@linux.vnet.ibm.com> <1357977704.6796.47.camel@marge.simpson.net> <1357985943.6796.55.camel@marge.simpson.net> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Provags-ID: V02:K0:U2SdAwJYLI6xV99zZjzuW6vEvJE8QyQRKpNF1cTabEF GayG56KJ0v5HcskxpyJJPqTI4qYQFSpOsrYEF/y/ZgH8fUzhCS +PJf49CNCbz+NI/BjeOCu1zitqfu/QOy5oS1JxIHJWM3NtpSMB 6tEsF+FlFxgjRqzfa2RO9NEdCEait5mgeevB3/Zi9i4V/kdjQB 6o3PLIHNLmz1buTIWnkNMc2kvpajieEqee30o+u1wh/Nmhoj6E 2PEeR7HNYu6xbILk6flYxqKyH66wWAZ/zK5DdEOzu1dToni5sT ljdphbnOouAm1lC0b8uMak62+yXzYXLvN17PpSWIUON8xl51sH 2vIvm06JNiczl3lAe9TrfSwxQYFqpwZ4UoR+Yp6VNnxF7QCnbl AWutckyuG+OLA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. 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: [] 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:[] [] 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] [] ? enqueue_entity+0x229/0xa40 [ 125.790423] [] ? enqueue_task_fair+0x214/0x560 [ 125.823023] [] ? select_idle_sibling+0xf4/0x120 [ 125.856434] [] select_task_rq_fair+0x249/0x280 [ 125.892564] [] ? native_apic_msr_write+0x36/0x40 [ 125.925262] [] try_to_wake_up+0x12b/0x2b0 [ 125.956939] [] default_wake_function+0xd/0x10 [ 125.989521] [] autoremove_wake_function+0x11/0x40 [ 126.022899] [] __wake_up_common+0x5a/0x90 [ 126.054874] [] __wake_up+0x43/0x70 [ 126.085086] [] force_quiescent_state+0xe9/0x130 [ 126.117469] [] rcu_prepare_for_idle+0x27e/0x480 [ 126.150317] [] rcu_eqs_enter_common+0x3d/0x100 [ 126.182428] [] rcu_idle_enter+0x92/0xe0 [ 126.213041] [] cpu_idle+0x78/0xd0 [ 126.242939] [] 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 [ [ 126.422108] CR2: 0000000000000040