Date: Wed, 9 Dec 1998 05:12:26 -0800 (PST) From: vk@spies.com (Venkatesh Krishnamurthi) To: aic7xxx@FreeBSD.ORG Subject: Why is the 5.1.5 aic7xxx using async with hard drives? Message-ID: <m0znjPm-000TjnC@spies.com>
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Hi,
I installed the 2.0.37-pre-1 kernel, which has the 5.1.5 aic7xxx driver, and
discovered that the driver now uses async transfers to the hard disks.
This results in a dramatic slowdown in disk throughput.
This is on a ASUS P2-BDS motherboard with the onboard 7890 controller and
2 IBM 9ZX UW disks. The BIOS shows the settings for transfers to the hard
disks to be synchronous.
I'm including the relevant portions from the output of "dmesg" and the output
from "cat /proc/scsi/aic7xxx/1"
Venkatesh
------------------------------------------------------------------------------
(scsi1) <Adaptec AIC-7890/1 Ultra2 SCSI host adapter> found at PCI 6/0
(scsi1) Wide Channel, SCSI ID=7, 32/255 SCBs
(scsi1) Downloading sequencer code... 407 instructions downloaded
scsi1 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.5/3.2.4
<Adaptec AIC-7890/1 Ultra2 SCSI host adapter>
scsi : 2 hosts.
Vendor: IBM Model: DGVS09U Rev: 03B0
Type: Direct-Access ANSI SCSI revision: 03
Detected scsi disk sda at scsi1, channel 0, id 0, lun 0
Vendor: IBM Model: DGVS09U Rev: 03B0
Type: Direct-Access ANSI SCSI revision: 03
Detected scsi disk sdb at scsi1, channel 0, id 1, lun 0
Vendor: PLEXTOR Model: CD-ROM PX-32TS Rev: 1.01
Type: CD-ROM ANSI SCSI revision: 02
Detected scsi CD-ROM sr0 at scsi1, channel 0, id 6, lun 0
SCSI device sda: hdwr sector= 512 bytes. Sectors= 17829870 [8705 MB] [8.7 GB]
sda: sda1 sda2 sda3 sda4 < sda5 sda6 sda7 sda8 sda9 >
SCSI device sdb: hdwr sector= 512 bytes. Sectors= 17829870 [8705 MB] [8.7 GB]
sdb: sdb1 sdb2 sdb3
from /proc/scsi/aic7xxx/1
Adaptec AIC7xxx driver version: 5.1.5/3.2.4
Compile Options:
AIC7XXX_RESET_DELAY : 5
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 AIC-7890/1 Ultra2 SCSI host adapter
Ultra2-LVD/SE Wide Controller
PCI MMAPed I/O Base: 0xe1000000
Adapter SEEPROM Config: SEEPROM found and used.
Adaptec SCSI BIOS: Enabled
IRQ: 14
SCBs: Active 0, Max Active 2,
Allocated 15, HW 32, Page 255
Interrupts: 9018
BIOS Control Word: 0x18a6
Adapter Control Word: 0x1c5e
Extended Translation: Enabled
Disconnect Enable Flags: 0xffff
Ultra Enable Flags: 0x0000
Tag Queue Enable Flags: 0x0000
Ordered Queue Tag Flags: 0x0000
Default Tag Queue Depth: 24
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:
(scsi1:0:0:0)
Device using Wide/Async transfers.
Device Negotiation Settings
Period Offset Bus Width
User 010 127 1
Goal 000 000 1
Current 000 000 1
Total transfers 6722 (6046 read;676 written)
blks(512) rd=168749; blks(512) wr=1808
< 512 512-1K 1-2K 2-4K 4-8K 8-16K 16-32K 32-64K 64-128K >128K
Reads: 0 1 2964 104 868 1007 34 24 1044 0
Writes: 0 0 571 72 31 1 1 0 0 0
(scsi1:0:1:0)
Device using Wide/Async transfers.
Device Negotiation Settings
Period Offset Bus Width
User 010 127 1
Goal 000 000 1
Current 000 000 1
Total transfers 2215 (2181 read;34 written)
blks(512) rd=4541; blks(512) wr=104
< 512 512-1K 1-2K 2-4K 4-8K 8-16K 16-32K 32-64K 64-128K >128K
Reads: 0 1 2169 5 4 1 0 1 0 0
Writes: 0 0 28 5 0 1 0 0 0 0
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