In the last episode (May 09), Amandeep said: > Amandeep wrote: > >>>>>>The transfer rate is about 15MB/s > >>>>>> > >>>>>>when I run > >>>>>>#dd if=/dev/zero of=/usr/junk bs=8192 > > > >OK with the above dd > > > >dd if=/dev/ad0 of=/dev/null bs=64k > > > >it gives me 56MB/s. from the start. > > So how does the block size makes the difference?? What is the true > transfer rate.?
At the moment, 56MB/sec :) Those two speeds aren't directly comparable, since your first was testing writes through the filesystem with a small blocksize, and the second was testing reads to the raw device with a large blocksize. Usually reading, using raw devices, and using large blocksizes are faster then writing, using a filesystem, and using small blocksizes, so all three changes probably contributed a little to the speed difference. -- Dan Nelson [EMAIL PROTECTED] _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"