[PlanetCCRMA] Lockup on tar command over ssh
Adam Swift
vikeul at omnitude.net
Sat Jun 21 07:20:13 PDT 2008
Michael Curtis <lists at moltenmercury.org> wrote:
> Sounds like it could be MMIO-related. I've seen it in the kernel
> options, it's apparently (and I could be over-simplifying here) an
> option to deal with large amounts of data by batching up transfers.
> In any case, these options have been marked experimental for some time
> in the kernel but given Fedora's track record with such things, it
> wouldn't surprise me if it's turned on by default. Of course, if it's
> not enabled, maybe turning it on may help. If you're confident in
> rebuilding RPMs, you might try a custom CCRMA kernel with MMIO turned
> off (on?), or Fernando may be able to help here.
With a bit of a learning curve because I'm a slackware user normally,
I compiled a custom kernel with CONFIG_8139TOO_PIO=y and everything
else the same, which fixed it. That turns off MMIO/turns on PIO for
the 8139too driver, so you were right. The default on Fedora kernels
is =n because it improves performance as you said.
The real question is, why do I need that for the realtime kernel but
not for the normal kernel?
Adam
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