On Sun, Mar 18, 2018 at 03:45:48PM +0000, Sad Clouds wrote: > Hello, using 'log' or both 'async, log' does not improve things much, > i.e. it's around 30-50 MBytes/sec: > > localhost# mount | grep wd0a > /dev/wd0a on / type ffs (asynchronous, log, local) > > localhost# dd if=/dev/zero of=out bs=1m count=1000 > 1000+0 records in > 1000+0 records out > 1048576000 bytes transferred in 21.330 secs (49159681 bytes/sec)
I get: amd64-test# mount /dev/wd0a on / type ffs (local) kernfs on /kern type kernfs (local) ptyfs on /dev/pts type ptyfs (local) procfs on /proc type procfs (local) tmpfs on /var/shm type tmpfs (local) amd64-test# dd if=/dev/zero of=out bs=1m count=1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 2.634 secs (398092634 bytes/sec) amd64-test# dd if=/dev/zero of=out bs=1m count=1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 2.634 secs (398092634 bytes/sec) amd64-test# dd if=/dev/zero of=out bs=1m count=1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 2.691 secs (389660349 bytes/sec) amd64-test# mount -u -o async / amd64-test# mount /dev/wd0a on / type ffs (asynchronous, local) kernfs on /kern type kernfs (local) ptyfs on /dev/pts type ptyfs (local) procfs on /proc type procfs (local) tmpfs on /var/shm type tmpfs (local) amd64-test# dd if=/dev/zero of=out bs=1m count=1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 0.755 secs (1388842384 bytes/sec) amd64-test# dd if=/dev/zero of=out bs=1m count=1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 0.765 secs (1370687581 bytes/sec) amd64-test# dd if=/dev/zero of=out bs=1m count=1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 0.756 secs (1387005291 bytes/sec) amd64-test# mount -u -o noasync / amd64-test# mount -u -o log / amd64-test# mount /dev/wd0a on / type ffs (log, local) kernfs on /kern type kernfs (local) ptyfs on /dev/pts type ptyfs (local) procfs on /proc type procfs (local) tmpfs on /var/shm type tmpfs (local) amd64-test# dd if=/dev/zero of=out bs=1m count=1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 2.787 secs (376238249 bytes/sec) amd64-test# dd if=/dev/zero of=out bs=1m count=1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 2.714 secs (386358142 bytes/sec) .. and this is close to what I expected (in relative timings). Martin
