----- Original Message ----- From: "Poul-Henning Kamp" <[EMAIL PROTECTED]>On -current and 5.4 you don't have to make partitions if you intend to use the entire disk (and provided you don't want to boot from it). You can simply:
newfs /dev/da0 mount /dev/da0 /where_ever
/dev/da0: 1526216.3MB (3125691008 sectors) block size 16384, fragment size 2048
using 8306 cylinder groups of 183.77MB, 11761 blks, 23552 inodes.
mount /dev/da0 /mnt
dd if=/dev/zero of=/mnt/testfile bs=64k count=100000 100000+0 records in 100000+0 records out 6553600000 bytes transferred in 44.424588 secs (147521908 bytes/sec)
/usr/bin/time -h dd of=/dev/null if=/mnt/testfile bs=64k count=100000 100000+0 records in
100000+0 records out
6553600000 bytes transferred in 48.150473 secs (136106658 bytes/sec)
48.27s real 0.01s user 12.33s sys
/usr/bin/time -h cat /mnt/testfile > /dev/null 48.12s real 0.26s user 14.92s sys
Raw read:
/usr/bin/time -h dd of=/dev/null if=/dev/da0 bs=64k count=100000 100000+0 records in
100000+0 records out
6553600000 bytes transferred in 32.028544 secs (204617482 bytes/sec)
32.02s real 0.02s user 2.73s sys
Look at the difference in sys times for raw vs. filesystem reads. With raw we're at 2.73s while reading from the filesystem requires 12.33s! From my position of complete ignorance that seems like a lot...
-- Jonathan Noack | [EMAIL PROTECTED] | OpenPGP: 0x991D8195
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