Re: [PARPORT] Speed of ppa 1.40 driver

Riley Williams (
Thu, 5 Feb 1998 21:16:09 +0000 (GMT)

Hi David.

> I've regularly used the following command to check drive access
> speed, slightly different from the above:

> Q> time dd if=/dev/sda of=/dev/null bs=1024 count=40960

> That copies 40M from the drive and, using that, I have measured
> transfer speeds around 240k/sec on an EPP port and around 130k/sec
> on an ECP port, which translate into 14.4M/min and 7.8M/min
> respectively...and, on a system running SPP mode only, I have never
> achieved better than 25k/sec (1.5M/min)...
> Before you ask, on my computer, the EPP mode produces corrupted
> ZipDisks but the ECP mode works fine. On a friend's computer, EPP
> mode works fine. Both machines are P166's.

I've just redone that, and got the following report with the computer
a P166/MMX and the Parallel port in EPP mode. The report was as

Q> 40960+0 records in
Q> 40960+0 records out
Q> 0.01user 0.01system 2:48.08elapsed 0%CPU (0avgtext+0avgdata
Q> 0maxresident)k
Q> 0inputs+0outputs (77major+6minor)pagefaults 0swaps

I make that 40 megs in 2 minutes 48 seconds, or 243.7k/second,
14.28M/minute ???

Best wishes from Riley.

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This archive was generated by hypermail 2.0b3 on Wed 30 Dec 1998 - 10:17:24 EST