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Full Discussion: ISCSI poor performance 1.5MB/s fresh install AIX7.1
Operating Systems AIX ISCSI poor performance 1.5MB/s fresh install AIX7.1 Post 302977139 by hicksd8 on Wednesday 13th of July 2016 06:52:03 AM
Old 07-13-2016
iSCSI performance can be greatly affected by a number of factors.

One of the major ones is the maximum payload configured. Turning on jumbo packets if both adapters support it is usually a good start.

There are other BIOS settings on FC adapters that also affect performance.
What adapters are you using?

Also, there may be the usual I/O system settings of write-thru vs write-back to consider.

A quick search of the IBM bible yielded this:
IBM Knowledge Center Error
 

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LEARN ABOUT NETBSD

trm

TRM(4)							   BSD Kernel Interfaces Manual 						    TRM(4)

NAME

     trm -- Tekram TRM-S1040 ASIC based PCI SCSI host adapter driver

SYNOPSIS

     trm* at pci? dev ? function ?
     scsibus* at trm?

DESCRIPTION

     The trm driver supports PCI SCSI host adapters based on the Tekram TRM-S1040 SCSI ASIC.

HARDWARE

     Supported SCSI controllers include:

	   Tekram DC-315 PCI Ultra SCSI adapter without flash BIOS and internal SCSI connector

	   Tekram DC-315U PCI Ultra SCSI adapter without flash BIOS

	   Tekram DC-395U PCI Ultra SCSI adapter with flash BIOS

	   Tekram DC-395UW PCI Ultra-Wide SCSI adapter with flash BIOS

	   Tekram DC-395F PCI Ultra-Wide SCSI adapter with flash BIOS and 68-pin external SCSI connector

     For Tekram DC-390 PCI SCSI host adapter, use pcscp(4) driver.

     For Tekram DC-310/U and DC-390U/UW/F PCI SCSI host adapters, use siop(4) driver.

SEE ALSO

     cd(4), ch(4), intro(4), pci(4), scsi(4), sd(4), ss(4), st(4), uk(4), scsipi(9)

     http://www.tekram.com/

AUTHORS

     The trm driver was originally written for NetBSD 1.4/i386 by Erich Chen of Tekram Technology, and Rui-Xiang Guo rewrote the driver to use
     bus_space(9) and bus_dma(9) for NetBSD 1.6.

BSD
								 November 6, 2001							       BSD
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