Date: Tue, 6 Oct 1998 22:07:23 +0100 From: Paul Haigh <paul@nailed.demon.co.uk> To: "aic7xxx@freebsd.org" <aic7xxx@FreeBSD.ORG> Subject: Synchronous/Asynchronous and Disconnect/Connect? Message-ID: <01BDF175.B29F64A0.paul@nailed.demon.co.uk>
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All,
Sorry If I'm asking a silly question but here goes anyway:
I'm a little confused about the difference between Sync and Async (and also
disconnect and connect). I've read a lot of stuff about the changing of
harddisc jumper settings to alter the behaviour of the driver under Linux.
(To either enable it or disable it)
Am I missing a simple trick to speed up my discs?
I've got two older Sun Microsystems discs in my linux server (both 4.5Mb
SCA drives)
The driver purports the following:
------------------------------------------------------------------------
Adaptec AIC7xxx driver version: 5.1.0pre6/3.2.4
Compile Options:
AIC7XXX_RESET_DELAY : 15
AIC7XXX_TAGGED_QUEUEING: Adapter Support Enabled
Check below to see which
devices use tagged queueing
AIC7XXX_PAGE_ENABLE : Enabled (This is no longer an option)
AIC7XXX_PROC_STATS : Enabled
Adapter Configuration:
SCSI Adapter: Adaptec AHA-294X Ultra SCSI host adapter
Ultra Wide Controller
PCI MMAPed I/O Base: 0xe1000000
Adaptec SCSI BIOS: Enabled
IRQ: 11
SCBs: Active 0, Max Active 2,
Allocated 15, HW 16, Page 255
Interrupts: 47205
BIOS Control Word: 0x19b6
Adapter Control Word: 0x005f
Extended Translation: Enabled
Disconnect Enable Flags: 0xffff
Ultra Enable Flags: 0xfffa
Tag Queue Enable Flags: 0x0000
Ordered Queue Tag Flags: 0x0000
Default Tag Queue Depth: 8
Tagged Queue By Device array for aic7xxx host instance 0:
{255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255}
Actual queue depth per device for aic7xxx host instance 0:
{1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}
Statistics:
(scsi0:0:0:0)
Device using Wide/Sync transfers at
20.0 MByte/sec, offset 8
Total transfers 36744 (21442 read;15302 written)
blks(512) rd=71931; blks(512) wr=42780
< 512 512-1K 1-2K 2-4K 4-8K 8-16K 16-32K 32-64K 64-128K
>128K
Reads: 0 1 18818 434 1170 945 26 27 21
0
Writes: 0 0 13117 1857 266 34 4 3 21
0
(scsi0:0:2:0)
Device using Wide/Sync transfers at
20.0 MByte/sec, offset 8
Total transfers 10402 (5637 read;4765 written)
blks(512) rd=81923; blks(512) wr=55246
< 512 512-1K 1-2K 2-4K 4-8K 8-16K 16-32K 32-64K 64-128K
>128K
Reads: 0 1 2581 75 1051 1474 166 107 182
0
Writes: 0 0 3372 760 426 23 15 3 166
0
------------------------------------------------------------------------
I only get around 5Mb/sec on these drives, which I would say was less than
I was expecting. Is the sync/async thing slowing me down?
This is running on an Adaptec 2940 UW controller.
Thanks for any help in advance.
Cheers,
Paul Haigh.
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