Bas Mevissen (sgm@stack.nl)
Thu, 5 Feb 1998 22:39:16 +0100
----------
: From: David Campbell <campbell@gear.torque.net>
: To: Bas Mevissen <sgm@stack.nl>
: Cc: linux-parport@torque.net
: Subject: Re: [PARPORT] Speed of ppa 1.40 driver
: Date: Thursday, February 05, 1998 9:24 AM
:
: > From: "Bas Mevissen" <sgm@stack.nl>
: > To: "Grant R. Guenther" <grant@torque.net>
: > Cc: <linux-parport@torque.net>
: > Subject: [PARPORT] Speed of ppa 1.40 driver
: > Date: Wed, 4 Feb 1998 21:37:26 +0100
:
: > Hi Grant,
: >
: >
: > I use the ppa 1.40 driver with kernel 2.0.33 on a : > I use the ppa 1.40 driver with kernel 2.0.33 on a 486@133MHz. I used to
get
: > around 16-20 Mb/min with my ZIP drive (R/W). This sank a bit to app. 11
: > Mb/min and in daily use the performance got even more worse.
:
: There is a known "feature" (problem) with VFAT/UMSDOS/MSDOS partitions on
: ZIP disks. It has to do with MSDOS <=> UNIX text file translation.
:
: > Can you give me some clues why the transfer speed is lower than before.
I
: > don't remember what version I got the slowdown, but I think is was at
the
: > point where the software/hardware direction detection routine came in.
: >
: > BTW. my I/O chip is a SMC37C665GT in EPP mode. PPA reports that this
one
: > has software direction control, is that correct?
:
: That should be fine.
:
: > The motherboard is a ASUS PVI/SP3 with the lates BIOS.
:
: Could you perform a test using:
: "time dd if=/dev/sda of=/dev/null count=20480"
56.38 seconds
:
: The above command should copy 10Mb from the ZIP drive and return the time
: taken. If this is less than 20Mb then I am worried...
It's time to get worried :-(
I did some other timings earlier this week:
16384 blocks of 1K: 1:34.82
16 blocks of 1M: 1:32.24
Not too much :-((
Keep hacking,
Bas.
:
: David Campbell
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This archive was generated by hypermail 2.0b3 on Wed 30 Dec 1998 - 10:17:24 EST