Re: "aborting sbp2 command" expected in kernel.org FireWire maybe

Mark K:

> Can you please tell me what you mean by "With my PC, Knoppix
> Linux-2.4.26 consistently reads hundreds of MiB thru FireWire at
> within three percent of that rate." I do nt understand what this
> sentence means or how you got the data.

I meant that I burned 2004-05-17 Knoppix 3.4 from linuxiso.org to CD-R,
rebooted, and tried something much like:

uname -msr
sudo blockdev --flushbufs /dev/scd0
sudo dd if=/dev/scd0 bs=1M skip=0 count=1 >/dev/null

uname -msr told me 2.4.26 and `dc` divided B by s for me. I got 2.6.6
instead only if I answered boot: knoppix26. I got "aborting sbp2
command" whenever I tried the kernel.org sources instead.

I'm guessing that further detail makes my English understandable?

If not, ouch, sorry, and should I repeat this experiment and capture a
tty log?

> within three percent of that rate.

The expected disc rate of 25 MB/s on the outside, I got from published
mfg specs, and I had previously compared that to actual experience e.g.
I see PATAPI & USB & SCSI & SATAPI keep pace in Linux & Mac & Windows,
and I see FireWire keep pace in Mac & Windows. Only FireWire in Linux
breaks. (Umm, technically speaking, provided we leave the new bleeding
edge options of USB ub.ko and SATAPI libata.ko out of the mix.)

> Post back the output of hdparm -tT or some other data.

Please tell me again this is still useful, if it is, and gladly I will.
  (Else I have no experience of hdparm.)

>> How do I build 2.6 Linux from kernel.org that does read at speed
>> without
>> "aborting sbp2 command"?
>> ...
> The common answer around here is that:
>
> 1) The 2.4 series 1394 drivers work better than the 2.6 series drivers
>
> 2) The 1394 drivers have never been optimized for performance

Thanks for defining normal for me, yes that's exactly what I see in
Knoppix.

By contrast, in kernel.org source, I see nothing work. Is that also
normal?

Can I help the kernel.org source in any way?

Pat LaVarre

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Received on Thu Sep 2 00:53:46 2004