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Gabriel_Blake
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Joined: 16 Sep 2007
Posts: 362
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 Posted: Thu Aug 04, 2011 12:50 pm Post subject: [SOLVED] Insane disk latency on laptop |
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Hi.
I've been having this problem since I bought the Acer 3820TG. Thanks to some stupid power saving feature, my hard drive stops when not used (it spins down). Then when it's used by some app it takes 1-3 seconds to start running! During this time the entire laptop freezes!
The funny thing is that when I use smplayer, the video stops every couple of minutes (for disk access), but when I play music via moc the disk is spinning constantly and everything runs smoothly.
I'm not sure whether it's a hardware issue, or some kernel/software config. Could you give me some hints ? (that tools can I use to get more info on the disk and it's performance or just how to fix it)
Last edited by Gabriel_Blake on Sat Aug 06, 2011 11:05 am; edited 1 time in total |
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Hypnos
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Joined: 18 Jul 2002
Posts: 2889
Location: Omnipresent
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| Posted: Thu Aug 04, 2011 2:37 pm Post subject: |
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Look at your disk settings:
| Code: | | # hdparm -i /dev/<your disk> |
Look at your disk health:
| Code: | | # smartctl -a /dev/<your disk> |
'smartctl' is in the package 'smartmontools' .
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tclover
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Joined: 10 Apr 2011
Posts: 516
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| Posted: Thu Aug 04, 2011 8:00 pm Post subject: |
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| Or increase the timeout value with something like `/sbin/hdparm -q -S120 /dev/sda` and you're all set. |
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Hypnos
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Gabriel_Blake
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Joined: 16 Sep 2007
Posts: 362
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| Posted: Thu Aug 04, 2011 11:59 pm Post subject: |
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I sense a disturbance in the force. Something is wrong here:
| Code: | /dev/sda:
Model=WDC WD5000BEVT-22A0RT0, FwRev=01.01A01, SerialNo=WD-WX31A50S2338
Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=50
BuffType=unknown, BuffSize=8192kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=976773168
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
AdvancedPM=yes: unknown setting WriteCache=enabled
Drive conforms to: Unspecified: ATA/ATAPI-1,2,3,4,5,6,7
* signifies the current active mode |
| Code: | === START OF INFORMATION SECTION ===
Model Family: Western Digital Scorpio Blue Serial ATA family
Device Model: WDC WD5000BEVT-22A0RT0
Serial Number: WD-WX31A50S2338
Firmware Version: 01.01A01
User Capacity: 500,107,862,016 bytes
Device is: In smartctl database [for details use: -P show]
ATA Version is: 8
ATA Standard is: Exact ATA specification draft version not indicated
Local Time is: Fri Aug 5 01:52:58 2011 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
General SMART Values:
Offline data collection status: (0x00) Offline data collection activity
was never started.
Auto Offline Data Collection: Disabled.
Self-test execution status: ( 0) The previous self-test routine completed
without error or no self-test has ever
been run.
Total time to complete Offline
data collection: (12780) seconds.
Offline data collection
capabilities: (0x7b) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new
command.
Offline surface scan supported.
Self-test supported.
Conveyance Self-test supported.
Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
General Purpose Logging supported.
Short self-test routine
recommended polling time: ( 2) minutes.
Extended self-test routine
recommended polling time: ( 149) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
SCT capabilities: (0x7037) SCT Status supported.
SCT Feature Control supported.
SCT Data Table supported.
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0
3 Spin_Up_Time 0x0027 188 153 021 Pre-fail Always - 1600
4 Start_Stop_Count 0x0032 016 016 000 Old_age Always - 84209
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
7 Seek_Error_Rate 0x002e 100 253 000 Old_age Always - 0
9 Power_On_Hours 0x0032 095 095 000 Old_age Always - 3721
10 Spin_Retry_Count 0x0032 100 100 051 Old_age Always - 0
11 Calibration_Retry_Count 0x0032 100 100 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 895
191 G-Sense_Error_Rate 0x0032 001 001 000 Old_age Always - 243
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 93
193 Load_Cycle_Count 0x0032 054 054 000 Old_age Always - 440974
194 Temperature_Celsius 0x0022 111 101 000 Old_age Always - 36
196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 100 253 051 Old_age Offline - 0
SMART Error Log Version: 1
No Errors Logged
SMART Self-test log structure revision number 1
No self-tests have been logged. [To run self-tests, use: smartctl -t]
SMART Selective self-test log data structure revision number 1
SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS
1 0 0 Not_testing
2 0 0 Not_testing
3 0 0 Not_testing
4 0 0 Not_testing
5 0 0 Not_testing
Selective self-test flags (0x0):
After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.
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Hypnos
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Joined: 18 Jul 2002
Posts: 2889
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| Posted: Fri Aug 05, 2011 1:38 am Post subject: |
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Looks normal enough. You can do what tclover says and see if the situation improves.
Also, if you like, run a disk diagnostic, as described in the smarctl man page. Probably it will be normal as well.
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redagadir
n00b
Joined: 06 Aug 2011
Posts: 29
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| Posted: Sat Aug 06, 2011 2:37 am Post subject: |
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tclover's advice looks wise, disable poweroff on inactivity.
just make sure it stays persistent across reboots.
and just to be sure, check these:
$ hdparm -tT /dev/sda #if sda is your disk
$ smartctl -t short /dev/sda
then after a while (few minutes)
$ smartctl -a /dev/sda
and read the short test result
if you have time:
$ smartctl -t long /dev/sda
and read again results after some time
Last edited by redagadir on Wed Dec 21, 2011 9:19 am; edited 1 time in total |
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Gabriel_Blake
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Joined: 16 Sep 2007
Posts: 362
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| Posted: Sat Aug 06, 2011 11:04 am Post subject: |
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| tclover wrote: | | Or increase the timeout value with something like `/sbin/hdparm -q -S120 /dev/sda` and you're all set. |
Absolutely fixed everything  Sets the spin-down to 10min so it's fine, but I've used it with -S0 so it's off.
I'm not sue if these settings are permanent, so to be sure I've added the command to /etc/local.d/driveNoStandby.start |
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Hypnos
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Posts: 2889
Location: Omnipresent
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| Posted: Sat Aug 06, 2011 11:39 am Post subject: |
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You can also put the setting in /etc/conf.d/hdparm , then add the hdparm service to the default runlevel.
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Hu
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Joined: 06 Mar 2007
Posts: 23093
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| Posted: Sat Aug 06, 2011 5:08 pm Post subject: |
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| Gabriel_Blake wrote: | | I'm not sue if these settings are permanent, so to be sure I've added the command to /etc/local.d/driveNoStandby.start |
If the settings are not permanent, you may find that they are forgotten after you hibernate and resume the system. If so, you would need to add an equivalent hdparm setting to your resume scripts to reapply the setting after the system wakes up. |
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