[2247] in linux-scsi channel archive
Why not using tagged command queueing?
daemon@ATHENA.MIT.EDU (Boris Tobotras)
Mon Aug 4 19:17:12 1997
To: linux-scsi@vger.rutgers.edu
Reply-To: tobotras@jet.msk.su
Date: Tue, 05 Aug 1997 00:00:25 +0400
From: Boris Tobotras <boris@xtalk.msk.su>
Hi,
I have somewhat low performance from my setup, getting only about
4M/sec reading from disk. My setup: PPro-200, AHA2940UW, Quantum Atlas
II. What goes wrong WRT subject?
dmesg:
OEM ID: INTEL Product ID: 440FX APIC at: 0xFEE00000
Processor #0 Pentium(tm) Pro APIC version 17
I/O APIC #2 Version 17 at 0xFEC00000.
Processors: 1
Console: 16 point font, 400 scans
Console: colour VGA+ 80x25, 1 virtual console (max 63)
pcibios_init : BIOS32 Service Directory structure at 0x000fdb70
pcibios_init : BIOS32 Service Directory entry at 0xfdb80
pcibios_init : PCI BIOS revision 2.10 entry at 0xfdba1
Probing PCI hardware.
Warning : Unknown PCI device (10b7:9050). Please read include/linux/pci.h
Calibrating delay loop.. ok - 199.07 BogoMIPS
Memory: 127944k/131072k available (664k kernel code, 384k reserved, 2080k data)
Swansea University Computer Society NET3.035 for Linux 2.0
NET3: Unix domain sockets 0.13 for Linux NET3.035.
Swansea University Computer Society TCP/IP for NET3.034
IP Protocols: ICMP, UDP, TCP
VFS: Diskquotas version dquot_5.6.0 initialized
Checking 386/387 coupling... Ok, fpu using exception 16 error reporting.
Checking 'hlt' instruction... Ok.
Linux version 2.0.30 (root@goliath.jet.msk.su) (gcc version 2.7.2.1) #3 Mon Aug 4 19:34:35 MSD 1997
Error: only one processor found.
Serial driver version 4.13 with no serial options enabled
tty00 at 0x03f8 (irq = 4) is a 16550A
tty01 at 0x02f8 (irq = 3) is a 16550A
Real Time Clock Driver v1.07
ide: i82371 PIIX (Triton) on PCI bus 0 function 57
ide0: BM-DMA at 0xffa0-0xffa7
ide1: BM-DMA at 0xffa8-0xffaf
md driver 0.35 MAX_MD_DEV=4, MAX_REAL=8
aic7xxx: BurstLen = 8 DWDs, Latency Timer = 64 PCLKS
aic7xxx: AHA-2940 Ultra Rev B.
aic7xxx: devconfig = 0x1580.
aic7xxx: Reading SEEPROM...done.
aic7xxx: Extended translation enabled.
aic7xxx: Memory check yields 16 SCBs, 255 page-enabled SCBs.
aic7xxx: Enabling wide channel of AHA-2940 Ultra-Wide.
AHA-2940 Ultra-WIDE (PCI-bus), I/O 0xec00, Mem 0xfebff000:
irq 10
bus release time 40 bclks
data fifo threshold 100%
SCSI CHANNEL A:
scsi id 7
scsi selection timeout 256 ms
scsi bus reset at power-on enabled
scsi bus parity enabled
scsi bus termination (low byte) enabled
scsi bus termination (high byte) enabled
aic7xxx: Downloading sequencer code...done.
aic7xxx: Resetting the SCSI bus...done.
scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 4.0/3.2/4.0
scsi : 1 host.
scsi0: Scanning channel A for devices.
Started kswapd v 1.4.2.2
Vendor: CONNER Model: CP30540 545MB3.5 Rev: AFBD
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
Vendor: SONY Model: CD-ROM CDU-55S Rev: 1.0f
Type: CD-ROM ANSI SCSI revision: 02
Vendor: QUANTUM Model: XP32275W Rev: LXY4
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sdb at scsi0, channel 0, id 6, lun 0
scsi0: Disconnection disabled, unable to enable tagged queueing for target 0, channel 0, LUN 0.
scsi0: Disconnection disabled, unable to enable tagged queueing for target 6, channel 0, LUN 0.
^^^^^^^^^^ Why these??
root /usr/src/scsiinfo# scsiinfo -a /dev/sda | grep -i queue
Scsiinfo version 1.5(eowmob)
Command Queueing 1
root /usr/src/scsiinfo# scsiinfo -a /dev/sdb | grep -i queue
Scsiinfo version 1.5(eowmob)
Command Queueing 1
What can I do? Any idea?
--
Best regards, -- Boris.
