Date: Wed, 15 Sep 1999 08:30:28 +0930 From: Greg Lehey <grog@lemis.com> To: Volker Stolz <stolz@Pool.Informatik.RWTH-Aachen.DE> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Erratic SCSI-ZIP throughput Message-ID: <19990915083028.A30655@freebie.lemis.com> In-Reply-To: <19990914151601.A378@solo.informatik.rwth-aachen.de>; from Volker Stolz on Tue, Sep 14, 1999 at 03:16:01PM %2B0200 References: <19990909123919.A6053@solo.informatik.rwth-aachen.de> <19990912114608.U10106@freebie.lemis.com> <19990914151601.A378@solo.informatik.rwth-aachen.de>
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On Tuesday, 14 September 1999 at 15:16:01 +0200, Volker Stolz wrote:
> On Sun, Sep 12, 1999 at 11:46:08AM +0930, Greg Lehey wrote:
>> On Thursday, 9 September 1999 at 12:39:19 +0200, Volker Stolz wrote:
>>> I always wondered why my ZIP is sooo slow (under FreeBSD, Win98 flies!), so I measured it
>>> using "ftp localhost" with a mounted ZIP and msdos-FS.
>>> Few files (all of about 5MB, give or take a few bytes) were transfered with ca. 1.8M/s,
>>> while most just made it to 80K/s and sometimes even below.
>>> I'm using the ncr810, everything is properly terminated. The problem occured under 2.2.x, too.
>>
>> There's a certain amount of overhead involved in copying a file, and I
>> suspect that what you're seeing is related, especially if the big
>> files are moving fast. What does iostat show? I don't know the
>> specs, but I'd expect about 30 to 50 transfers a second for a Zip
>> drive.
>
> You're right, it shows 48 tps and 0.09 M/s. But hell, that's too slow! At least compared
> with acceses from Win{NT,98} to the same drive.
It depends on what transfers you're doing. If you're transferring .09
MB in 48 transfers, your average transfer size is about 2 kB. You
should be able to do better than that on an average mix.
Greg
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