Date: Fri, 15 May 1998 13:47:49 -0400 (EDT) From: The Hermit Hacker <scrappy@hub.org> To: scsi@FreeBSD.ORG Subject: Atrocious transfer rates... Message-ID: <Pine.BSF.3.96.980515134003.304A-100000@hub.org>
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Hi...
Well, just plugged in the newest CAM snapshot, got everything
compiled and installed, and am getting terrible transfer rates, as far as
I can tell...granted, I just might be missing something in my kernel
config, but I swear my pre-CAM kernel had better performance, with pretty
much no change in settings.
By slower, I mean that the VIKING II below, that I ran IOZONE on
several times with the older driver, was reporting closer to 11Meg/s...
====================================================================
hub> dmesg | grep da2
da2 at ahc1 bus 0 target 1 lun 0
da2: <Quantum XP34300W L912> Fixed Direct Access SCSI2 device
da2: Serial Number PCB=JF60324939 U; HDA=MP62542171
da2: 20.0MB/s transfers (10.0MHz, offset 8, 16bit), Tagged Queueing
Enabled
da2: 4101MB (8399520 512 byte sectors: 255H 63S/T 522C)
(da2:ahc1:0:1:0): tagged openings now 37
(da2:ahc1:0:1:0): tagged openings now 36
Writing the 69 Megabyte file, 'iozone.tmp'...34.046875 seconds
Reading the file...39.593750 seconds
IOZONE performance measurements:
2125062 bytes/second for writing the file
1827352 bytes/second for reading the file
hub# df .
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/da2s1a 992751 461077 452254 50% /usr/local/httpd
======================================================================
da1 at ahc1 bus 0 target 0 lun 0
da1: <Quantum XP34300W L912> Fixed Direct Access SCSI2 device
da1: Serial Number PCB=JF60539596 U; HDA=MP61750113
da1: 20.0MB/s transfers (10.0MHz, offset 8, 16bit), Tagged Queueing
Enabled
da1: 4101MB (8399520 512 byte sectors: 255H 63S/T 522C)
(da1:ahc1:0:0:0): tagged openings now 36
(da1:ahc1:0:0:0): tagged openings now 33
Writing the 62 Megabyte file, 'iozone.tmp'...34.695312 seconds
Reading the file...27.132812 seconds
IOZONE performance measurements:
1873789 bytes/second for writing the file
2396055 bytes/second for reading the filehub
# df .
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/da1s1a 992751 572953 340378 63% /news
======================================================================
hub# dmesg | grep da0
da0 at ahc0 bus 0 target 0 lun 0
da0: <QUANTUM VIKING II 4.5WSE 3506> Fixed Direct Access SCSI2 device
da0: Serial Number 194805310043
da0: 20.0MB/s transfers (10.0MHz, offset 8, 16bit), Tagged Queueing
Enabled
da0: 4350MB (8910423 512 byte sectors: 255H 63S/T 554C)
(da0:ahc0:0:0:0): tagged openings now 63
Writing the 82 Megabyte file, 'iozone.tmp'...13.632812 seconds
Reading the file...15.726562 seconds
IOZONE performance measurements:
6307079 bytes/second for writing the file
5467388 bytes/second for reading the filehub
# df .
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/da0s1d 1477506 927430 431876 68% /var
=======================================================================
hub# dmesg | grep ahc
ahc0: <Adaptec 2940 Ultra SCSI adapter> rev 0x00 int a irq 10 on pci0.11.0
ahc0: aic7880 Wide Channel A, SCSI Id=7, 16/255 SCBs
ahc1: <Adaptec 2940 Ultra SCSI adapter> rev 0x01 int a irq 11 on pci0.12.0
ahc1: aic7880 Wide Channel A, SCSI Id=7, 16/255 SCBs
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