Re: How might a SATA drive interfere with DVB-S

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Hi,

Jon Burgess wrote:

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.

SATA hard disk: /dev/sda
PATA dvd drive: /dev/sr0

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.

CPU load is about 15 % with software decoding, using VDR, vdr-xine and xine.

Bye.
--
Dipl.-Inform. (FH) Reinhard Nissl
mailto:rnissl@xxxxxx

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