The ZIP Drive is USB as well?

Are you using a UHCI controller (dmesg)?

Nick
>
> Hello,
>
> It seems to me that the slowness of umass driver is not caused by msdosfs.
> I know about the msdosfs problems, for example when I run dd from my ZIP
> drive (with FAT) with request size of 2048, it's extremely slow. When I
> change request size to 64K, it gains normal speed (about 1MB/s).
>
> But with my camera (umass), I get:
>
> # dd if=/dev/da0s1 of=/tmp/nikon bs=2048 count=10
> 10+0 records in
> 10+0 records out
> 20480 bytes transferred in 0.379587 secs (53953 bytes/sec)
>
> # dd if=/dev/da0s1 of=/tmp/nikon bs=4096 count=10
> 10+0 records in
> 10+0 records out
> 40960 bytes transferred in 0.719477 secs (56930 bytes/sec)
>
> # dd if=/dev/da0s1 of=/tmp/nikon bs=8192 count=10
> 10+0 records in
> 10+0 records out
> 81920 bytes transferred in 1.389069 secs (58975 bytes/sec)
>
> # dd if=/dev/da0s1 of=/tmp/nikon bs=65536 count=10
> 10+0 records in
> 10+0 records out
> 655360 bytes transferred in 10.832928 secs (60497 bytes/sec)
>
> # dd if=/dev/da0s1 of=/tmp/nikon bs=524288 count=1
> 1+0 records in
> 1+0 records out
> 524288 bytes transferred in 8.668605 secs (60481 bytes/sec)
>
> The speed is nearly the same, no matter about the request size.
>
> What do you think about it ?
>
> Tomas
>
> On Sat, 24 Aug 2002, Nick Hibma wrote:
>
> >
> > Yes, unfortunately it is a known issue in the msdos file system. The
> > requests it makes are too small for the driver to take advantage of the
> > speed of USB.
> >
> > Nick
>
>

-- 
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