Re: adfsbuffers

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2 total messages Started by /G=Owen/S=Smith/O=SJ-Research/AD... Fri, 18 Dec 1992 15:08

#697

Author: /G=Owen/S=Smith/O=SJ-Research/AD...
Date: Fri, 18 Dec 1992 15:08

20 lines
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m_sattle@informatik.uni-kl.de (Matthias Sattler) wrote:

>What are adfsbuffers really good for?

>They should speed up the (hard)disc access but in fact they don't.
>I tried many different tests (hd-speed tests, compiling c programs, ...)
>on the harddisc of my A540 (RO2) with adfsbuffers 0 and adfsbuffers 256k.
>EVERY test with adfsbuffers configured was slightly slower than the test
>without adfsbuffers.
>Hmmmmmm... funny isn't it?

Not really. Since the A540 has a SCSI hard disk, changing ADFSBuffers isn't
going to make the slightest difference. What you need in this case is some
SCSIFSBuffers, but Acorn SCSIFS doesn't support buffers. Brian Brunswick's
SCSIFS does, and is obtainable as Partitions on Newcastle. ADFSBuffers
should measurably speed up your ADFS floppy accesses, but be careful what
sort of access you time. OS_GBPB random file access benefits a lot more than
OS_File Load and Save.

Owen.

Re: adfsbuffers

#700

Author: Matthias Sattler
Date: Fri, 18 Dec 1992 20:36

26 lines
1583 bytes

/G=Owen/S=Smith/O=SJ-Research/ADMD=INTERSPAN/C=GB/@mhs-relay.ac.uk wrote:

>>What are adfsbuffers really good for?

>>They should speed up the (hard)disc access but in fact they don't.
>>I tried many different tests (hd-speed tests, compiling c programs, ...)
>>on the harddisc of my A540 (RO2) with adfsbuffers 0 and adfsbuffers 256k.
>>EVERY test with adfsbuffers configured was slightly slower than the test
>>without adfsbuffers.
>>Hmmmmmm... funny isn't it?
>
>Not really. Since the A540 has a SCSI hard disk, changing ADFSBuffers isn't
>going to make the slightest difference. What you need in this case is some
>SCSIFSBuffers, but Acorn SCSIFS doesn't support buffers. Brian Brunswick's
>SCSIFS does, and is obtainable as Partitions on Newcastle. ADFSBuffers
>should measurably speed up your ADFS floppy accesses, but be careful what
>sort of access you time. OS_GBPB random file access benefits a lot more than
>OS_File Load and Save.
>
>Owen.

Things definitely are slower with adfsbuffers configured.

Matthias Sattle

email: m_sattle@informatik.uni-kl.de

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