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Operating Systems Solaris Performance (iops) becomes bad, what is the reason? Post 302533143 by achenle on Wednesday 22nd of June 2011 08:34:46 PM
Old 06-22-2011
Quote:
Originally Posted by ForgetChen
Thank you for your replies!

Code:
 
the result with running vdbench with 1MB IO :

Jun 22, 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
16:06:21.052 31 782.00 782.00 1048576 100.00 149.715 161.195 0.493 4.5 4.3
16:06:22.051 32 781.00 781.00 1048576 100.00 149.697 161.233 0.475 4.5 4.2
16:06:23.051 33 781.00 781.00 1048576 100.00 148.282 154.836 2.734 4.7 4.3

The io rate is always very bad ,especial with 512 IO size.
Now I doubt the DMA property and buf struct in scsi_init_pkt function. But I didn't understand these fully.
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?
 

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ql-hba-snapshot(8)					       System Administration						ql-hba-snapshot(8)

NAME
ql-hba-snapshot - display specific information of the QLogic HBA. SYNOPSIS
ql-hba-snapshot <Host number> [OPTIONS] DESCRIPTION
FC HBA Snapshot Utility This utility displays the details of the QLogic HBA attached to the system. It uses one of the two file systems for scanning: proc or sysfs. <Host number> | <-a/--all> [optional] Provide the <HOST NUMBER> to display the detailed information of the HBA. With no option specified, general information of all hosts will be displayed. Ex. # /usr/sbin/ql-hba-snapshot <Host Number> # /usr/sbin/ql-hba-snapshot --procfs <Host Number> (For procfs) -h, --help Prints the help message. Ex. # /usr/sbin/ql-hba-snapshot --help -hl, --hostlist This option displays the list of QLogic hosts (HBAs) connected to this system. The <HOST NUMBER> can be obtained by using following command Ex. # /usr/sbin/ql-hba-snapshot --hostlist -p, --parameters This option displays the command line parameters that can be passed to the QLogic HBA driver. Ex. # /usr/sbin/ql-hba-snapshot --parameters <Host Number> -s, --statistics This option displays the statistical information for specified host. Stastics option is only supported in "sysfs" based scan. Ex. # /usr/sbin/ql-hba-snapshot --statistics <Host number/--all> -proc, --procfs This options forces the the utility to scans information based on "procfs", instead of default sysfs. Ex. # /usr/sbin/ql-hba-snap- shot --procfs [Other valid option] -v, --verbose This enables verbose display. The detailed information of LUNs will be displayed in addition to standard one. This option is only supported in sysfs. Ex. # /usr/sbin/ql-hba-snapshot --verbose <Host number/-a> SEE ALSO
ql-dynamic-tgt-lun-disc(8), ql-lun-state-online(8), ql-set-cmd-timeout(8) Matthias Schmitz <;matthias@sigxcpu.org> July 2009 ql-hba-snapshot(8)
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