On Friday 20 May 2005 12:13, Itay Duvdevani wrote:
> Lately I've purchased a new USB OfficeJet 5510 printer (one of those
> all-in-one thingies).
> I got it running under my Debian unstable server, using CUPS and HPOJ
> without a hitch.
I have a similar (PSC-1110) device with same setup (CUPS,HPOJ) on FC2/3
> It's a printing server (a weak PII with about 133MHz), and since I've
> installed HPOJ (I've used HPIJS for my old printer) printing takes
> FOREVER to complete (ptal-mlcd takes about 99% of CPU usage).
Had the same problem on FC2. Worse, the stupid ptal-mlcd would hang
many times in the 'D' (uninterruptible sleep) forever (days). In that
state it would actually knock off the complete USB system -- any process
that would try accessing USB (say download photos from my camera) would
enter the same state (this forced me many times to *reboot* the machine
just to get it back to normal state).
> I've gone through the troubleshooting documents of the driver, and saw
> that printing slowness is a known issue. Taking their advice, I
> checked to see if I can turn off composite USB (can't, printer won't
> work), and verified I'm using usblp.c (that's a 2.6.10 machine) and
> not libusb. All of this didn't help.
The advice back then was to disable usblp (on SMP machine -- I had HT)
and use libusb. It didn't help a lot. Somehow the FC3 version became
somewhat better. The current situation is (FC3 kernel 2.6.10 until 2.6.11,
hpoj-0.91-9):
- Never get the bloody hangs anymore (no more 'D' state forever).
- Printing is slow (~1-2 minutes per-page) but working.
- Still uses libusb
- Load is up during printing, but not as horrible as your case.
Part of the load is taken by the conversion to/from Postscript
as CUPS logical model is to unify everything as Postscript. Tzafrir
remarked about the 'raw' CUPS driver which is worth testing -- I
haven't tested it so far. However, for the raw mode the application
need to raster the data for the specific printer -- I am not sure
that the hpoj (or the newer hplib project mentioned in other post)
have any libraries to enable applications to do that.
This printing technology/drivers look like a big mess -- where
are the good old Postscript days...
--
Oron Peled Voice/Fax: +972-4-8228492
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