Hi there,
I recently installed OpenBSD on one of my servers and I have noticed that I
am experiencing slow SATA write speeds when using SMB to copy files across
my network.
I currently have 1xSATA disk & 2xPATA disks in my server.
When I copy files across my network (GigE) to my PATA disk, I am seeing
approx 600Mbps, however when I copy to the SATA disk I only see approx
125Mbps.
I also noticed that the CPU utilization (for SMBd) is at about 90% when
copying to the SATA disk, but only hovers around 10% when copying the PATA
disk.
I thought this may have been a driver issue with SATA, therefore causing the
increased CPU when copying. But I copied some files across to the same SATA
disk using FTP instead and the CPU stayed quite low and the write speeds
were approx 600Mbps.
Does anybody have any ideas what may be causing the issues?
I have provided some info from dmesg below which may be of use.
cpu0: Intel(R) Core(TM)2 Duo CPU E7200 @ 2.53GHz ("GenuineIntel" 686-class)
2.54 GHz
bios0 at mainbus0: AT/286+ BIOS, date 09/02/08, BIOS32 rev. 0 @ 0xf1df0,
SMBIOS rev. 2.5 @ 0xf0000 (50 entries)
bios0: vendor Phoenix Technologies, LTD version "ASUS P5N-EM HDMI ACPI BIOS
Revision 0401" date 09/02/2008
bios0: ASUSTeK Computer INC. P5N-EM HDMI
spdmem0 at iic0 addr 0x50: 1GB DDR2 SDRAM non-parity PC2-6400CL5
spdmem1 at iic0 addr 0x52: 1GB DDR2 SDRAM non-parity PC2-6400CL5
pciide0 at pci0 dev 8 function 0 "NVIDIA MCP73 IDE" rev 0xa1: DMA, channel 0
configured to compatibility, channel 1 configured to compatibility
pciide1 at pci0 dev 14 function 0 "NVIDIA MCP73 AHCI" rev 0xa2: DMA
(unsupported), channel 0 wired to native-PCI, channel 1 wired to native-PCI
wd0 at pciide0 channel 0 drive 0: <ST3320620A>
wd0: 16-sector PIO, LBA48, 305245MB, 625142448 sectors
wd1 at pciide0 channel 0 drive 1: <ST3750640A>
wd1: 16-sector PIO, LBA48, 715404MB, 1465149168 sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 5
wd1(pciide0:0:1): using PIO mode 4, Ultra-DMA mode 5
wd2 at pciide1 channel 0 drive 0: <ST31500341AS>
wd2: 16-sector PIO, LBA48, 1430799MB, 2930277168 sectors
Thanks,
Kristian
--
View this message in context:
http://www.nabble.com/Slow-SATA-write-speeds-with-SMB-tp23130953p23130953.html
Sent from the openbsd user - misc mailing list archive at Nabble.com.
