Re: kern/46325: wapbl + disk io = temporary system freeze

[Christoph Egger <Christoph_Egger%gmx.de@localhost>]

The following reply was made to PR kern/46325; it has been noted by GNATS.

From: Christoph Egger <Christoph_Egger%gmx.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, 
 netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/46325: wapbl + disk io = temporary system freeze
Date: Thu, 12 Apr 2012 14:10:48 +0200

 On 04/12/12 13:05, Christoph Egger wrote:
 > The following reply was made to PR kern/46325; it has been noted by GNATS.
 >
 > From: Christoph Egger<Christoph_Egger%gmx.de@localhost>
 > To: gnats-bugs%NetBSD.org@localhost
 > Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
 >   netbsd-bugs%netbsd.org@localhost
 > Subject: Re: kern/46325: wapbl + disk io = temporary system freeze
 > Date: Thu, 12 Apr 2012 13:01:11 +0200
 >
 >   On 04/12/12 12:45, Christoph Egger wrote:
 >   >  The following reply was made to PR kern/46325; it has been noted by 
 > GNATS.
 >   >
 >   >  From: Christoph Egger<Christoph_Egger%gmx.de@localhost>
 >   >  To: gnats-bugs%NetBSD.org@localhost
 >   >  Cc: Martin Husemann<martin%duskware.de@localhost>, 
 > kern-bug-people%netbsd.org@localhost,
 >   >    gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
 >   >  Subject: Re: kern/46325: wapbl + disk io = temporary system freeze
 >   >  Date: Thu, 12 Apr 2012 12:40:50 +0200
 >   >
 >   >    On 04/12/12 11:50, Martin Husemann wrote:
 >   >    >   The following reply was made to PR kern/46325; it has been noted 
 > by GNATS.
 >   >    >
 >   >    >   From: Martin Husemann<martin%duskware.de@localhost>
 >   >    >   To: gnats-bugs%NetBSD.org@localhost
 >   >    >   Cc:
 >   >    >   Subject: Re: kern/46325: wapbl + disk io = temporary system freeze
 >   >    >   Date: Thu, 12 Apr 2012 11:47:51 +0200
 >   >    >
 >   >    >     Stupid questions, just to make sure we are not barking up the 
 > wrong tree:
 >   >    >
 >   >    >      - your underlying disk io speed is OK? (dmesg excerpts or 
 > bonnie++ runs
 >   >    >        would give hints)
 >   >
 >   >    wd0 at atabus1 drive 0
 >   >    wd0:<ST3500413AS>
 >   >    wd0: drive supports 16-sector PIO transfers, LBA48 addressing
 >   >    wd0: 465 GB, 969021 cyl, 16 head, 63 sec, 512 bytes/sect x 976773168 
 > sectors
 >   >    wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 
 > (Ultra/133)
 >   >
 >   >    that's ok.
 >   >
 >   >    pciide0 at pci0 dev 17 function 0: AMD Hudson SATA Controller (rev. 
 > 0x40)
 >   >    pciide0: bus-master DMA support present, but unused (no driver 
 > support)
 >   >    pciide0: primary channel configured to native-PCI mode
 >   >    pciide0: using ioapic0 pin 19 for native-PCI interrupt
 >   >    atabus0 at pciide0 channel 0
 >   >    pciide0: secondary channel configured to native-PCI mode
 >   >    atabus1 at pciide0 channel 1
 >   >
 >   >    eek, DMA support is missing in pciide0.
 >
 >   Problem seems to be solved: I changed the BIOS SATA mode from IDE to AHCI.
 >
 >
 >   load averages:  0.95,  0.47,  0.19;               up 0+00:04:52
 >      12:58:40
 >   135 threads: 18 idle, 111 sleeping, 2 zombie, 4 on CPU
 >   CPU0 states:  0.0% user,  0.0% nice,  9.4% system,  5.6% interrupt,
 >   85.0% idle
 >   CPU1 states:  1.6% user,  0.0% nice,  4.4% system,  0.0% interrupt,
 >   94.0% idle
 >   CPU2 states:  0.2% user,  0.0% nice,  0.0% system,  0.0% interrupt,
 >   99.8% idle
 >   CPU3 states:  6.6% user,  0.0% nice, 68.1% system,  0.0% interrupt,
 >   25.3% idle
 >   Memory: 783M Act, 16K Wired, 88M Exec, 177M File, 6852M Free
 >   Swap: 8171M Total, 8171M Free
 >
 >      PID   LID     UID  PRI STATE      TIME   WCPU    CPU NAME      COMMAND
 >      483     1       0   26 CPU/3      0:36 74.88% 69.34% -         cvs
 >        0    63       0  124 syncer/1   0:02  6.15%  6.15% ioflush   [system]
 >
 >
 >   I am still puzzled why so much 'system' time is spent.
 
 I forgot the dmesg snippets:
 
 ahcisata0 at pci0 dev 17 function 0: AMD Hudson AHCI SATA Controller 
 (rev. 0x40)
 ahcisata0: interrupting at ioapic0 pin 19
 ahcisata0: 64-bit DMA
 ahcisata0: AHCI revision 1.30, 6 ports, 32 slots, CAP 
 0xf732ff05<PSC,SSC,PMD,SPM,ISS=0x3=Gen3,SCLO,SAL,SALP,SMPS,SSNTF,SNCQ,S64A>
 atabus0 at ahcisata0 channel 0
 atabus1 at ahcisata0 channel 1
 atabus2 at ahcisata0 channel 2
 atabus3 at ahcisata0 channel 3
 atabus4 at ahcisata0 channel 4
 atabus5 at ahcisata0 channel 5
 
 ahcisata0 port 1: device present, speed: 6.0Gb/s
 
 wd0 at atabus1 drive 0
 wd0: <ST3500413AS>
 wd0: drive supports 16-sector PIO transfers, LBA48 addressing
 wd0: 465 GB, 969021 cyl, 16 head, 63 sec, 512 bytes/sect x 976773168 sectors
 wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
 wd0(ahcisata0:1:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 6 
 (Ultra/133) (using DMA)
 
 
 Christoph