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Full Discussion: IBM AIX I/O Performance Tuning
Operating Systems AIX IBM AIX I/O Performance Tuning Post 303032108 by rowswell on Monday 11th of March 2019 05:05:14 PM
Old 03-11-2019
Hi - as you can see in your results the xdisk tool with 1 MB block size drove the V7000 up to 3.4 Gigabytes per second.
The reason I mentioned using 0x40000 for the hdisk max_transfer is because that is what the SDDPCM driver used by default and I have seen better V7000 performance with this value compared to the 0x80000 default that AIX MPIO uses.
You can leave the FC adapter at 0x100000 or you could change it to 0x200000. This tunable is independent of the hdisk one.

If you do reduce the hdisk max_transfer from 0x80000 to 0x40000 you can then compare the xdisk results now that you have already run it once.

Thanks
Dean

--- Post updated at 09:05 PM ---

Regarding your question of tuning max_xfer_size you can do it dynamically assuming your LUN's have multiple paths. (lspath to confirm)
Code:
rmdev -l fscsiX -R
chdev -l fcsX -a max_xfer_size=0x200000
cfgmgr

 

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LEARN ABOUT NETBSD

tr

TR(4)							   BSD Kernel Interfaces Manual 						     TR(4)

NAME

     tr -- TROPIC based shared memory Token-Ring cards device driver

SYNOPSIS

     tr0 at isa? port 0xa20 iomem 0xd800 irq ?
     tr* at isa? port ? irq ?
     tr* at isapnp?
     tr* at mca? slot ?
     tr* at pcmcia? function ?

DESCRIPTION

     The tr device driver supports TROPIC I based shared-memory Token-Ring cards.

HARDWARE

     Supported cards include the following IBM and 3Com models:

	   IBM	 Token-Ring Network PC Adapter

	   IBM	 Token-Ring Network PC Adapter II

	   IBM	 Token-Ring Network Adapter/A

	   IBM	 Token-Ring Network 16/4 Adapter

	   IBM	 Token-Ring Network 16/4 Adapter/A

	   IBM	 Token-Ring 16/4 Credit Card Adapter

	   IBM	 Token Ring Auto 16/4 Credit Card Adapter

	   IBM	 Turbo 16/4 Token Ring PC Card

	   IBM	 16/4 ISA Adapter

	   IBM	 Auto 16/4 Token-Ring ISA Adapter

	   IBM	 Token Ring 16/4 Credit Card Adapter

	   IBM	 Token Ring Auto 16/4 Credit Card Adapter

	   IBM	 Turbo 16/4 Token Ring PC Card

	   3Com  3C619 TokenLink

	   3Com  3C319 TokenLink Velocity

	   3Com  3C389 TokenLink Velocity PC Card

SOURCE ROUTING

     Setting IFF_LINK0 enables Token-Ring source routing.  Setting IFF_LINK1 uses all-routes broadcasts otherwise single-route broadcasts are
     used.

NOTES

     The MCA attachment has been only tested on IBM Token Ring 16/4 Adapter/A so far.  It doesn't support ifmedia(4) yet, too.

SEE ALSO

     ifmedia(4), intro(4), isa(4), isapnp(4), mca(4), pcmcia(4), ifconfig(8)

HISTORY

     The tr driver appeared in NetBSD 1.4.

BUGS

     The PCMCIA attachment does not work with the cbb(4) CardBus driver.

BSD
								  April 14, 1999							       BSD
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