indeed... Tue Jan 19 22:11:38 CET 2010 Tue Jan 19 22:51:50 CET 2010
I will try your test now The point is that I have many huge USB drives which I would not like to throw away just like that I cannot afford looking for new usb drives which are fine on obsd. I would like to understand what is going on (at least within my limits of understanding!) Thanks T. 2010/1/19 David Vasek <va...@fido.cz>: > On Tue, 19 Jan 2010, T. Tofus von Blisstein wrote: > >> Hello, >> >> this is an example. Attached is a 1GB (fat!) usb memory stick. It took >> 40 minutes to copy 285M. >> >> This one was >> >> Jan 19 21:18:04 hux /bsd: umass0: using SCSI over Bulk-Only >> Jan 19 21:18:04 hux /bsd: scsibus1 at umass0: 2 targets, initiator 0 >> Jan 19 21:18:04 hux /bsd: sd1 at scsibus1 targ 1 lun 0: <-Pretec, >> 01GB, 2.00> SCSI2 0/direct removable >> Jan 19 21:18:04 hux /bsd: sd1: 983MB, 512 bytes/sec, 2015231 sec total >> >> I will repeat the test with all other ports now. > > There shouldn't be any difference among individual USB ports. > > First, try this: > > # dd if=/dev/rsd1c bs=64k count=1k of=/dev/null > > (or just hit ^C if it takes too long) and see what the reading speed of the > _device_ is. If you don't have any data on the device and if you are willing > to recreate the MBR and filesystem there, you can also test the writing > speed: > > # dd if=/dev/zero bs=64k count=1k of=/dev/rsd1c > > Otherewise you are also measuring the filesystem performance and such. For > some reason (which is unknown to me), "foreign" filesystems, such as ext2fs > and msdos, are quite slow on OpenBSD, both for reading and for writing. The > CPU is not the bottleneck in operations on these filesystems. > > Regards, > David > -- Pau
