Now that I’ve switched to FreeBSD 9.0, I thought I’d repeat the write speed test I did in 2010 on my desktop machine.
The test is writing approximately 10 GB data from /dev/zero to /tmp/foo;
dd if=/dev/zero of=/tmp/foo bs=10M count=1000
The test was done on otherwise idle machine. But contrary to 2010, it is now running some extra daemons.
|Operating System:||FreeBSD 9.0-RELEASE-p3 amd64|
|CPU:||Intel(R) Core(TM)2 Quad CPU Q9300 @ 2.50GHz|
|Controller:||atapci0: Intel ICH7 UDMA100 controller|
/dev/ada0p2 491M 204M 247M 45% / devfs 1.0k 1.0k 0B 100% /dev /dev/ada0p4.eli 382G 179G 173G 51% /home /dev/ada0p5 49G 3.7G 41G 8% /tmp /dev/ada0p6 19G 10G 7.9G 56% /usr /dev/ada0p7 2.2G 311M 1.8G 15% /var devfs 1.0k 1.0k 0B 100% /var/named/dev
Output of atacontrol cap ad4:
pass1: <WDC WD5001ABYS-01YNA0 59.01D01> ATA-8 SATA 2.x device pass1: 150.000MB/s transfers (SATA, UDMA5, PIO 8192bytes) protocol ATA/ATAPI-8 SATA 2.x device model WDC WD5001ABYS-01YNA0 firmware revision 59.01D01 serial number WD-WCAS87154115 WWN 50014ee256bb8a8a cylinders 16383 heads 16 sectors/track 63 sector size logical 512, physical 512, offset 0 LBA supported 268435455 sectors LBA48 supported 976773168 sectors PIO supported PIO4 DMA supported WDMA2 UDMA6 media RPM 7200 Feature Support Enabled Value Vendor read ahead yes yes write cache yes yes flush cache yes yes overlap no Tagged Command Queuing (TCQ) no no Native Command Queuing (NCQ) yes 32 tags SMART yes yes microcode download yes yes security yes no power management yes yes advanced power management no no automatic acoustic management yes yes 254/0xFE 128/0x80 media status notification no no power-up in Standby yes no write-read-verify no no unload no no free-fall no no data set management (TRIM) no
10485760000 bytes transferred in 217.169097 secs (48283850 bytes/sec) 10485760000 bytes transferred in 214.993010 secs (48772562 bytes/sec)
The writing speed (46 MiB/s) is a lot slower than on 8.2 (75 MiB/s). Maybe this has something to do with the fact that the drive is not working as a SATA2 device, but only at SATA speed.