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Full Discussion: Performance (iops) becomes bad, what is the reason?
Operating Systems Solaris Performance (iops) becomes bad, what is the reason? Post 302533157 by ForgetChen on Wednesday 22nd of June 2011 10:29:01 PM
Old 06-22-2011
Quote:
Originally Posted by achenle
If I'm reading that right, you're getting 781 MB/sec with 1 MB IO operations.

How fast do you think it should be going?
You are right. The performance is normal with 1M IO operations.

While, the problem is that the performance is bad with 512 bytes compared with the one without our virtual HBA dirver.

The performace of same disk without VHBA is shown as below:
Code:
 
Jun 23, 2011 interval i/o MB/sec bytes read resp resp resp cpu% cpu%
rate 1024**2 i/o pct time max stddev sys+usr sys
11:12:20.729 1 73623.00 35.95 512 100.00 0.391 30.889 0.353 31.1 21.0
11:12:21.102 2 34416.00 16.80 512 100.00 0.775 14.747 0.140 39.5 25.3
11:12:22.093 3 66576.00 32.51 512 100.00 1.099 15.570 0.222 36.3 24.9
11:12:23.089 4 66305.00 32.38 512 100.00 1.687 16.420 0.283 36.5 25.1
11:12:24.084 5 66237.00 32.34 512 100.00 1.899 16.832 0.208 35.9 24.5
11:12:25.082 6 66379.00 32.41 512 100.00 1.895 17.151 0.274 36.2 25.0

The max io rate can reach 7k while the io rate with our VHBA is only 1.7k when running vdbench with 512 bytes IO.
That is the problem. But I don't know why.
 

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LEARN ABOUT FREEBSD

vpo

VPO(4)							   BSD Kernel Interfaces Manual 						    VPO(4)

NAME

     vpo -- parallel to SCSI interface driver

SYNOPSIS

     device vpo

     For one or more SCSI busses:
     device scbus

DESCRIPTION

     The vpo driver provide access to parallel port Iomega Zip and Jaz drives.

HARDWARE

     The vpo driver supports the following parallel to SCSI interfaces:

     o	 Adaptec AIC-7110 Parallel to SCSI interface (built-in to Iomega ZIP drives)
     o	 Iomega Jaz Traveller interface
     o	 Iomega MatchMaker SCSI interface (built-in to Iomega ZIP+ drives)

USAGE

     The driver should let you use a printer connected to the drive while transferring data.

     DOS and FreeBSD file systems are supported.  When mounting a DOS file system or formatting a FreeBSD file system, check the slice of the disk
     with the fdisk(8) utility.

     In order to unixify a ZIP disk, put the following in /etc/disktab:

     zip|zip 100:
	     :ty=removable:se#512:nc#96:nt#64:ns#32:
	     :pa#196608:oa#0:ba#4096:fa#512:
	     :pb#196608:ob#0:bb#4096:fb#512:
	     :pc#196608:oc#0:bc#4096:fc#512:

     and use bsdlabel(8).

     If you have trouble with your driver, your parallel chipset may not run properly at the detected mode (NIBBLE, PS2 or EPP).  Tune the ppc(4)
     bootflags to force other modes.

SEE ALSO

     da(4), lpt(4), ppbus(4), ppc(4), scsi(4)

HISTORY

     The vpo manual page first appeared in FreeBSD 3.0.

AUTHORS

     This manual page was written by Nicolas Souchu.

BUGS

     During boot, the driver first tries to detect a classic ZIP, then a ZIP+.	The ZIP+ detection is intrusive and may send erroneous characters
     to your printer if the drive is not connected to your parallel port.

BSD
								 December 14, 2004							       BSD
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