Hi,
After upgrading kernel from 4.15.9-1 to 4.16.3-1 (Arch Linux) my
router started responding very slowly. These message were repeatedly
showing up in the logs:
Apr 23 10:21:43 link kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x50000 action 0x6 frozen
Apr 23 10:21:43 link kernel: ata1: SError: { PHYRdyChg CommWake }
Apr 23 10:21:43 link kernel: ata1.00: failed command: WRITE DMA
Apr 23 10:21:43 link kernel: ata1.00: cmd ca/00:08:60:5d:cd/00:00:00:00:00/e1 tag 9 dma 4096 out
res 50/01:01:01:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Apr 23 10:21:43 link kernel: ata1.00: status: { DRDY }
Apr 23 10:21:43 link kernel: ata1.00: error: { AMNF }
Apr 23 10:21:43 link kernel: ata1: hard resetting link
Apr 23 10:21:43 link kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Apr 23 10:21:43 link kernel: ata1.00: configured for UDMA/133
Apr 23 10:21:43 link kernel: ata1: EH complete
I noticed that the SATA LPM states had now been enabled, so tried
changing from 'med_power_with_dipm' to 'medium_power' and the problem
went away:
echo medium_power > /sys/class/scsi_host/host0/link_power_management_policy
Perhaps there is something about my combination of controller/drive that is not compatible?
# hdparm -i /dev/sda
/dev/sda:
Model=SAMSUNG MZMPC128HBFU-000MV, FwRev=CXM14M1Q, SerialNo=S19FNYAD394414
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=unknown, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=250069680
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
AdvancedPM=no WriteCache=enabled
Drive conforms to: unknown: ATA/ATAPI-2,3,4,5,6,7
# cat /proc/cpuinfo | grep "model name"
model name : Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz
model name : Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz
model name : Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz
model name : Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz
# cat /sys/class/scsi_device/0\:0\:0\:0/device/model
SAMSUNG MZMPC128
Regards,
Kevin Shanahan.
--
To unsubscribe from this list: send the line "unsubscribe linux-ide" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
