Date: Thu, 16 Sep 1999 18:06:51 +0000 (GMT) From: <phreak@liquednet.net> To: aic7xxx@freebsd.org Subject: RAID / multiple concurrent drive access Message-ID: <Pine.LNX.4.10.9909161801130.29522-100000@aridhol>
next in thread | raw e-mail | index | archive | help
Hello all. I hope that this list can help me with this problem I have. I
have an AIC-7880 on board controller, and 2 Seagate UW 4.5 gig 10,000 RPM
cheetah drives. Each drive sustains about 13MB/s sequential reads, and
under NT I configured them as a very fast stripe set, handling about
20MB/s. I tried this in linux, and the combined throughput is still only
13MB/s, and I even tried starting 2 dd commands at once to read from the
drives, and the combined throughput is stil only 13MB/s. This seems to
indicate that the AIC-7xxx driver is not making use of disconnect/reselect
and/or tagged command queueing. I am running linux 2.2.12 and have those
options enabled. I am running on a dual PII-233 system. I will include a
printout of my /proc/scsi/aic7xxx/0 file at the end of this email. Any
thoughs on why I am having this problem and how to fix it would be greatly
apreciated.
Adaptec AIC7xxx driver version: 5.1.19/3.2.4
Compile Options:
TCQ Enabled By Default : Enabled
AIC7XXX_PROC_STATS : Disabled
AIC7XXX_RESET_DELAY : 3
Adapter Configuration:
SCSI Adapter: Adaptec AIC-7880 Ultra SCSI host adapter
Ultra Wide Controller
PCI MMAPed I/O Base: 0xe1800000
Adapter SEEPROM Config: SEEPROM found and used.
Adaptec SCSI BIOS: Enabled
IRQ: 15
SCBs: Active 0, Max Active 16,
Allocated 30, HW 16, Page 255
Interrupts: 120253
BIOS Control Word: 0x10b6
Adapter Control Word: 0x005e
Extended Translation: Enabled
Disconnect Enable Flags: 0xfffb
Ultra Enable Flags: 0x0003
Tag Queue Enable Flags: 0x0003
Ordered Queue Tag Flags: 0x0003
Default Tag Queue Depth: 8
Tagged Queue By Device array for aic7xxx host instance 0:
{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
Actual queue depth per device for aic7xxx host instance 0:
{8,8,1,1,1,1,1,1,1,1,1,1,1,1,1,1}
Statistics:
(scsi0:0:0:0)
Device using Wide/Sync transfers at 40.0 MByte/sec, offset 8
Transinfo settings: current(12/8/1/0), goal(12/8/1/0), user(12/15/1/0)
Total transfers 19973 (19973 reads and 0 writes)
(scsi0:0:1:0)
Device using Narrow/Async transfers.
Transinfo settings: current(12/0/0/0), goal(0/0/0/0), user(0/0/0/0)
Total transfers 100791 (61659 reads and 39132 writes)
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe aic7xxx" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.LNX.4.10.9909161801130.29522-100000>