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SubjectRe: Linux 2.0.36pre1 (Epson 800 lp still slow)
On Fri, 24 Jul 1998, Douglas Paul wrote:

> > I've put Linux 2.0.36 pre-patch-1 on ftp.uk.linux.org:/pub/linux/alan
> > o The lp slowdown should be gone I hope
>
> Not for me. Under polling, many long waits during printing.
> If I set an IRQ with tunelp, nothing comes out.

> rsimpson@ewrcsdra.demon.co.uk also reported similar problems with
> an Epson 800 in comp.os.linux.misc. (He also has an HP Laserjet 4
> which is fine under both 34 and 35.)

Likewise, no improvement with 2.0.36pre1. Debug out from lp follows.
Same small file printed under 2.0.35 using lp.c from 2.0.36pre1 and
2.0.34. As previously reported, long pauses during 2.0.36pre1 printing.

**** 2.0.36pre1 ****

Jul 27 11:57:42 TallRon kernel: lp1 ioctl, cmd: 0x5401, arg: 0xbffffbc4
Jul 27 11:57:43 TallRon kernel: lp1 ioctl, cmd: 0x5401, arg: 0xbffff0f4
Jul 27 11:57:43 TallRon kernel: lp1 success after 1 counts.
Jul 27 11:57:43 TallRon kernel: lp1 success after 1000 counts.
Jul 27 11:57:47 TallRon kernel: lp1 sleeping at 3072 characters for 2 jiffies
Jul 27 11:57:47 TallRon kernel: lp1 sleeping at 3070 characters for 2 jiffies

**** 2.0.34 ****

Jul 27 12:04:18 TallRon kernel: lp1 ioctl, cmd: 0x5401, arg: 0xbffffbc4
Jul 27 12:04:19 TallRon kernel: lp1 ioctl, cmd: 0x5401, arg: 0xbffff0f4
Jul 27 12:04:21 TallRon kernel: lp1 sleeping at 3703 characters for 2 jiffies
Jul 27 12:04:21 TallRon kernel: lp1 sleeping at 1740 characters for 2 jiffies
Jul 27 12:04:21 TallRon kernel: lp1 sleeping at 1 characters for 2 jiffies
Jul 27 12:04:21 TallRon kernel: lp1 sleeping at 0 characters for 2 jiffies
Jul 27 12:04:22 TallRon last message repeated 53 times
Jul 27 12:04:22 TallRon kernel: lp1 sleeping at 1 characters for 2 jiffies
Jul 27 12:04:22 TallRon kernel: lp1 sleeping at 0 characters for 2 jiffies
Jul 27 12:04:23 TallRon last message repeated 52 times
Jul 27 12:04:23 TallRon kernel: lp1 sleeping at 1 characters for 2 jiffies
Jul 27 12:04:23 TallRon kernel: lp1 sleeping at 0 characters for 2 jiffies
Jul 27 12:04:24 TallRon last message repeated 53 times
Jul 27 12:04:24 TallRon kernel: lp1 sleeping at 1 characters for 2 jiffies
Jul 27 12:04:24 TallRon kernel: lp1 sleeping at 0 characters for 2 jiffies
Jul 27 12:04:25 TallRon last message repeated 9 times
Jul 27 12:04:25 TallRon kernel: lp1 sleeping at 1 characters for 2 jiffies

Have not tried using interupts. If anyone would like me to perform more
tests then please let me know.

Hope that this helps,

----------------------------------------------------------------------------

Richard Simpson
Farnborough, Hants, Uk Fax: 01252 392976
rsimpson@ewrcsdra.demon.co.uk


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