Well, testing with a file of zeroes is not a very good benchmark - see the result for OmniOS/CE below: ---- ➜ xci dd if=/dev/zero of=out bs=1000000 count=1000 1000+0 records in 1000+0 records out 1000000000 bytes transferred in 0.685792 secs (1458168149 bytes/sec) ----
So I decided to switch to previously created random contents and move it with dd between two different disks. Here is what I get: --- --------Centos 7.4 -------- XFS ➜ xci dd if=/dev/urandom of=rand.out bs=1000000 count=1000 1000+0 records in 1000+0 records out 1000000000 bytes (1.0 GB) copied, 9.6948 s, 103 MB/s ➜ xci dd if=rand.out of=/data/rand.out bs=1000000 1000+0 records in 1000+0 records out 1000000000 bytes (1.0 GB) copied, 2.49195 s, 401 MB/s --------OmniOS CE --------- ZFS ➜ xci dd if=/dev/urandom of=rand.out bs=1000000 count=1000 1000+0 records in 1000+0 records out 1000000000 bytes transferred in 16.982885 secs (58882812 bytes/sec) ➜ xci dd if=/dev/urandom if=rand.out of=/data/testme/rand.out bs=1000000 1000+0 records in 1000+0 records out 1000000000 bytes transferred in 21.341659 secs (46856713 bytes/sec) --------NetBSD-current amd64 8.99.12 ------- FFS ➜ sysbuild dd if=/dev/urandom of=rand.out bs=1000000 count=1000 1000+0 records in 1000+0 records out 1000000000 bytes transferred in 32.992 secs (30310378 bytes/sec) ➜ sysbuild dd if=rand.out of=/usr/pkgsrc/rand.out bs=1000000 1000+0 records in 1000+0 records out 1000000000 bytes transferred in 23.535 secs (42489908 bytes/sec) ---- OmniOS/ZFS and NetBSD/FFS results are comparable, the Centos/XFS one is a bit hard to explain. This is on the same Windows 10 host as before. Chavdar On Mon, 19 Mar 2018 at 23:16 Chavdar Ivanov <ci4...@gmail.com> wrote: > I ran my tests with our dd and also with /usr/pkg/gnu/bin/dd, supposedly > the same or similar enough to the one in Centos; there was no significant > difference between the two. The fastest figure came on the system disk when > it was attached to an IDE controller with ICH6 chipset. about 180MB/sec. > All other combinations return between 110 and 160 MB/sec. Tried > with/without host os cache, also there is a setting that the disk is solid > state. No apparent difference. > > My host system is build 17120, so that may explain something. Not the > difference in figures though, comparing to Centos. > > Chavdar > > On Mon, 19 Mar 2018 at 23:06 <m...@netbsd.org> wrote: > >> On Mon, Mar 19, 2018 at 02:58:06PM +0100, Fekete Zolt?n wrote: >> > Any setting which influence the test and I didn't apply? >> >> yes, need to figure out what to make GNU dd behave the same. >> It has different defaults. >> >
