Date: Tue, 15 Mar 2005 00:00:18 GMT From: Jason Bacon <bacon@smithers.neuro.mcw.edu> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/78711: Parallel printer incredibly slow Message-ID: <200503150000.j2F00Io3091853@freefall.freebsd.org>
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The following reply was made to PR kern/78711; it has been noted by GNATS. From: Jason Bacon <bacon@smithers.neuro.mcw.edu> To: Bruce Evans <bde@zeta.org.au> Cc: Suporte Matik <asstec@matik.com.br>, freebsd-bugs@freebsd.org, FreeBSD-gnats-submit@freebsd.org Subject: Re: kern/78711: Parallel printer incredibly slow Date: Mon, 14 Mar 2005 17:55:42 -0600 (CST) Almost forgot... Thanks! On Sat, 12 Mar 2005, Bruce Evans wrote: > On Fri, 11 Mar 2005, Suporte Matik wrote: > >> On Friday 11 March 2005 19:42, Jason Bacon wrote: >>>> Description: >>> >>> The parallel printer runs ridiculously slow. It prints normally >>> for about 30 seconds, then prints one line every 5 or 10 minutes. >>> ... >> >> any two lines text file needs 15 minutes to be printed >> >>>> Fix: >>> >>> lptcontrol -s resolves the problem. This looks to me much >>> ... >> >> does not fix, the problem is as well with lpr and cups local/remote >> >> the only way to get "some more speed" is using b/w and 150 dpi on a HPDJ, >> any >> gray or color mode is slow > > Try changing the interrupt storm threshold (hw.intr_storm_threshold) to > something larger than the printer can generate. FreeBSD-5.3 has interrupt > storm detection that misdetects the very high interrupt rates that can > be caused by printers (combined with low quality interrupt handling in > the lpt driver) as interrupt storms. > >> doesn't matter what you set in the BIOS or whatever, any gray or colormode >> on >> 5.3 is that inacceptable slow >> >> using the exactly same printer and port settings on 5.2.1 or 4.11 brings >> you >> back to the expected printing speed > > FreeBSD-5.2 and FreeBSD-current have different bugs in interrupt storm > detection and handling. In at least some versions, the bugs make printers > go even slower if an interrupt storm is misdetected for them, but > misdetection is apparently rarer. > > FreeBSD-4 doesn't have interrupt storm detection, so any problems with > printer speed are local to the driver. > > Bruce >
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