Reinhard Nissl wrote:
Hi,
Attached you'll find my lspci -vv. Interrupts seem to be different, but
is a latency of 0 ok for the SATA device?
------------------------------------------------------------------------
00:1f.2 IDE interface: Intel Corporation 82801EB (ICH5) SATA Controller (rev 02) (prog-if 8a [Master SecP PriP])
Subsystem: Fujitsu Siemens Computer GmbH: Unknown device 101c
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin A routed to IRQ 169
Region 0: I/O ports at <unassigned>
Region 1: I/O ports at <unassigned>
Region 2: I/O ports at <unassigned>
Region 3: I/O ports at <unassigned>
Region 4: I/O ports at 2c00 [size=16]
Since this controller is integrated into the ICH SouthBridge chip
instead of being on a discrete PCI bus I'm not sure if the latency
figure makes any difference. I had a quick look at a machine with an
'845 chipset and that had similar 0 latency values.
I think however that some of the settings the above indicate that you're
running in legacy/combined mode rather than using the native sata_piix
driver. Does the disk appear as /dev/sdX or /dev/hdX? If using the
libata drivers it should appear as /dev/sdX.
If not, try going into the BIOS and try to find a SATA setting referred
to as Native/Enhanced (it may currently be set to something like
legacy/combined).
I've seen one machine where using the legacy mode resulted in a
performance of around 1MB/s at 99% CPU utilisation. Switching to the
enhanced mode got the performance up to a much more normal 40MB/s @ ~20%
CPU.
Jon
_______________________________________________
linux-dvb@xxxxxxxxxxx
http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
