Date: Fri, 17 Sep 1999 10:15:33 +0930 From: Greg Lehey <grog@lemis.com> To: Volker Stolz <stolz@Pool.Informatik.RWTH-Aachen.DE> Cc: FreeBSD Questions <questions@FreeBSD.org> Subject: Re: Erratic SCSI-ZIP throughput Message-ID: <19990917101533.O55065@freebie.lemis.com> In-Reply-To: <19990916153731.C9119@solo.informatik.rwth-aachen.de>; from Volker Stolz on Thu, Sep 16, 1999 at 03:37:31PM %2B0200 References: <19990909123919.A6053@solo.informatik.rwth-aachen.de> <19990912114608.U10106@freebie.lemis.com> <19990914151601.A378@solo.informatik.rwth-aachen.de> <19990915083028.A30655@freebie.lemis.com> <19990916153731.C9119@solo.informatik.rwth-aachen.de>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thursday, 16 September 1999 at 15:37:31 +0200, Volker Stolz wrote:
>>>> 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.
>
> I know, but what goes wrong?
Nothing goes wrong. You're running into a basic limitation of the
device.
Greg
--
When replying to this message, please copy the original recipients.
For more information, see http://www.lemis.com/questions.html
See complete headers for address, home page and phone numbers
finger grog@lemis.com for PGP public key
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19990917101533.O55065>