[Expired for cupsys (Ubuntu) because there has been no activity for 60
days.]
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usb backend hogs cpu
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The profiler seemed to indicate that
a lot of time was being spent in the uhci-hcd module, so
I tried the printer on the same CUPS setup but with a machine with
a USB2 port rather than USB1 (and thus ehci-hcd and not uhci-hcd). Much better:
the usb backend took a reasonable proportion of CPU cycle
And, when I compiled a kernel with debugging symbols
for profiling, I activated usb debugging: here's the output it
generated in the course of one failed printing attempt followed
by switching the printer off then on again. These are the messages
I got from it: some of them are a little startling (
The callgraph generated by oprofile
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I've been doing some profiling. Executive summary:
most of the cpu effort seems to be consumed by two function
calls (uhci_urb_enqueue and uhci_irq) in the uhci-hcd module.
Anyway, profiles attached.
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Another attachment: profile broken down by symbol name.
Incidentally, the profiles were done with oprofile.
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I have been experimenting with setting the nice value of the runaway usb
process, and it seems to have good effects. There are basically 4
processes involved in cups printing with this processor: cupsd, gs-esp,
rastertogutenprint, and usb. It is the usb process which hogs the cpu.
If I set the nic
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On Wed, 2006-08-09 at 08:40 +, Pascal De Vuyst wrote:
> Thanks for you bug report.
> Could you also provide the cups error_log:
> 1) change LogLevel in cupsd.conf from warning to debug
> 2) restart cups: sudo /etc/init.d/cupsys restart
> 3) print something
> 4) attach the relevant parts of /var
Thanks for you bug report.
Could you also provide the cups error_log:
1) change LogLevel in cupsd.conf from warning to debug
2) restart cups: sudo /etc/init.d/cupsys restart
3) print something
4) attach the relevant parts of /var/log/cups/error_log
** Changed in: cupsys (Ubuntu)
Status: Unc
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