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Date: Mon, 29 Mar 2010 15:26:47 +1100 From: andrew hendry <andrew.hendry@...il.com> To: Mark Knecht <markknecht@...il.com> Cc: Linux Kernel List <linux-kernel@...r.kernel.org> Subject: Re: 100%wa for long periods of time Hi, Do you know what is causing the wait? Probably not the best way, but I have used something like the following for a similar case before: echo "1" > /proc/sys/vm/block_dump ... wait a short while ... echo "0" > /proc/sys/vm/block_dump Then have a look at dmesg | egrep "READ|WRITE|dirtied" Andrew. On Mon, Mar 29, 2010 at 2:44 PM, Mark Knecht <markknecht@...il.com> wrote: > Hi all, > Long time lurker. Seldom post here. I'm not a programmer. > > OK, so I'm bring up new hardware - Intel i7 920, Intel DX58SO > motherboard, 6GB Crucial triple channel DRAM. Using both the Gentoo > install CD (2.6.32 based) as well as 2.6.33-gentoo after booting the > install I am running into long periods of time - sometimes 30 seconds, > sometimes lasting minutes, where the machine appears to hang or slow > down very drastically. The only thing I've noticed so far is that > there are 100% waiting periods showing up in top. No messages in dmesg > or /var/log/messages. Just long periods where the the compiler acts > like the system has really slowed down and sometimes appears almost > completely dead. > > When this clears up then the system screams along building > software. When it happens is see things like the following where CPU's > 1 & 5 sit at 100% waiting which lasted 2 or 3 minutes before clearing > up. The CPU that goes to 100% does move around but it does seem to > land on #5 more than others. > > keeper ~ # top > > top - 02:27:17 up 28 min, 2 users, load average: 2.76, 1.95, 1.30 > Tasks: 125 total, 1 running, 124 sleeping, 0 stopped, 0 zombie > Cpu0 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > Cpu1 : 0.0%us, 0.0%sy, 0.0%ni, 0.0%id,100.0%wa, 0.0%hi, 0.0%si, 0.0%st > Cpu2 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > Cpu3 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > Cpu4 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > Cpu5 : 0.0%us, 0.3%sy, 0.0%ni, 0.0%id, 99.7%wa, 0.0%hi, 0.0%si, 0.0%st > Cpu6 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > Cpu7 : 0.0%us, 0.3%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st > Mem: 6107024k total, 1448676k used, 4658348k free, 187492k buffers > Swap: 4200988k total, 0k used, 4200988k free, 915900k cached > > > keeper ~ # lspci > 00:00.0 Host bridge: Intel Corporation X58 I/O Hub to ESI Port (rev 13) > 00:01.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI > Express Root Port 1 (rev 13) > 00:03.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI > Express Root Port 3 (rev 13) > 00:07.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI > Express Root Port 7 (rev 13) > 00:10.0 PIC: Intel Corporation 5520/5500/X58 Physical and Link Layer > Registers Port 0 (rev 13) > 00:10.1 PIC: Intel Corporation 5520/5500/X58 Routing and Protocol > Layer Registers Port 0 (rev 13) > 00:14.0 PIC: Intel Corporation 5520/5500/X58 I/O Hub System Management > Registers (rev 13) > 00:14.1 PIC: Intel Corporation 5520/5500/X58 I/O Hub GPIO and Scratch > Pad Registers (rev 13) > 00:14.2 PIC: Intel Corporation 5520/5500/X58 I/O Hub Control Status > and RAS Registers (rev 13) > 00:14.3 PIC: Intel Corporation 5520/5500/X58 I/O Hub Throttle Registers (rev 13) > 00:19.0 Ethernet controller: Intel Corporation 82567LM-2 Gigabit > Network Connection > 00:1a.0 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB > UHCI Controller #4 > 00:1a.1 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB > UHCI Controller #5 > 00:1a.2 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB > UHCI Controller #6 > 00:1a.7 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB2 > EHCI Controller #2 > 00:1b.0 Audio device: Intel Corporation 82801JI (ICH10 Family) HD > Audio Controller > 00:1c.0 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Port 1 > 00:1c.1 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Port 2 > 00:1c.4 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Port 5 > 00:1d.0 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB > UHCI Controller #1 > 00:1d.1 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB > UHCI Controller #2 > 00:1d.2 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB > UHCI Controller #3 > 00:1d.7 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB2 > EHCI Controller #1 > 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 90) > 00:1f.0 ISA bridge: Intel Corporation 82801JIR (ICH10R) LPC Interface Controller > 00:1f.2 SATA controller: Intel Corporation 82801JI (ICH10 Family) SATA > AHCI Controller > 00:1f.3 SMBus: Intel Corporation 82801JI (ICH10 Family) SMBus Controller > 02:00.0 VGA compatible controller: nVidia Corporation G96 [GeForce > 9500 GT] (rev a1) > 06:00.0 IDE interface: Marvell Technology Group Ltd. 88SE6121 SATA II > Controller (rev b2) > 07:03.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A > IEEE-1394a-2000 Controller (PHY/Link) > keeper ~ # > > keeper ~ # uname -a > Linux keeper 2.6.33-gentoo #1 SMP PREEMPT Mon Mar 29 01:12:08 PDT 2010 > x86_64 Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz GenuineIntel GNU/Linux > keeper ~ # > > keeper ~ # lsmod > Module Size Used by > ipv6 207757 24 > usbhid 21529 0 > snd_hda_codec_realtek 239530 1 > uhci_hcd 18047 0 > ehci_hcd 30854 0 > usbcore 115023 4 usbhid,uhci_hcd,ehci_hcd > sg 23029 0 > snd_hda_intel 17688 0 > snd_hda_codec 45755 2 snd_hda_codec_realtek,snd_hda_intel > firewire_ohci 20022 0 > e1000e 111701 0 > snd_pcm 58104 2 snd_hda_intel,snd_hda_codec > processor 23121 0 > rtc_cmos 7678 0 > snd_timer 15030 1 snd_pcm > rtc_core 11093 1 rtc_cmos > snd 37476 5 > snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_pcm,snd_timer > soundcore 800 1 snd > snd_page_alloc 5809 2 snd_hda_intel,snd_pcm > firewire_core 36109 1 firewire_ohci > rtc_lib 1617 1 rtc_core > thermal 11650 0 > keeper ~ # > > Thanks, > Mark > -- 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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