[7434] in linux-scsi channel archive
Aha1520 slow disk access under 2.2.x
daemon@ATHENA.MIT.EDU (E. Lefty Kreouzis)
Wed Oct 27 03:28:34 1999
Message-ID: <XFMail.991027102139.lefty@fage.gr>
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Date: Wed, 27 Oct 1999 10:21:39 +0300 (EEST)
Reply-To: lefty@fage.gr
From: "E. Lefty Kreouzis" <lefty@fage.gr>
To: linux-scsi@vger.rutgers.edu
Hi to all,
Has anyone noticed that the adaptec aha152x module has extremely slow disk
accesses under linux 2.2.x?
I tried it with 2.2.5 (the redhat stock kernel)
2.2.12 (stock both as a module and compiled in)
with very slow accesses
E.g.
# hdparm -Tt /dev/sda
/dev/sda:
Timing buffer-cache reads: 64 MB in 0.77 seconds =83.12 MB/sec
Timing buffered disk reads: 32 MB in 39.16 seconds = 0.82 MB/sec
# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: QUANTUM Model: FIREBALL ST3.2S Rev: 0F0C
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 02 Lun: 00
Vendor: DEC Model: TZK10 Rev: 03C1
Type: Sequential-Access ANSI SCSI revision: 02
# cat /proc/scsi/aha152x/0
Adaptec 152x SCSI driver; $Revision: 1.7 $
ioports 0x0340 to 0x035f
interrupt 0x0b
disconnection/reconnection enabled
parity checking enabled
synchronous transfers disabled
1 commands currently queued
enabled debugging options: (abort) (reset)
queue status:
no not yet issued commands
no current command
disconnected commands:
0xc1e01a00: target=0; lun=0; cmnd=( 0x0a 0x07 0xf0 0x0c 0x04 0x00 );
residual=10
24; buffers=1; phase |disconnected|send_ident|; in other(MESSAGE IN);
phaseend;
next=0x00000000
waiting: SCSISEQ (RESELI ); SCSISIG (DATA OUT); INTSTAT (lo); SSTAT (SWRAP
BUSFR
EE PHASECHG ); SSTAT (); SXFRCTL0 (CH1 ); SIGNAL (); SELID (81), SSTAT2
(SEMPTY
); SFCNT (0); SCSICNT (0), OFFCNT(0), SSTAT4 (); DMACNTRL0 (16BIT PIO WRITE
INTE
N ); DMASTAT (WORDRDY DFIFOEMP )
enabled interrupts (ENSELDI )
# uname -a
Linux socrates 2.2.5-15 #1 Mon Apr 19 23:00:46 EDT 1999 i686 unknown
Under 2.0.x it is:
# uname -a
Linux hera.eparxia-p.fage.gr 2.0.34 #1 Fri May 8 16:05:57 EDT 1998 i686
unknown
# /sbin/hdparm -Tt /dev/sda
/dev/sda:
Timing buffer-cache reads: 64 MB in 0.78 seconds =82.05 MB/sec
Timing buffered disk reads: 32 MB in 18.81 seconds = 1.70 MB/sec
# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: SEAGATE Model: ST34520N Rev: 1444
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 02 Lun: 00
Vendor: TANDBERG Model: TDC 3800 Rev: =08:
Type: Sequential-Access ANSI SCSI revision: 02
# cat /proc/scsi/aha152x/0
Adaptec 152x SCSI driver; $Revision: 1.18 $
ioports 0x0340 to 0x035f
interrupt 0x0b
disconnection/reconnection enabled
parity checking enabled
synchronous transfers disabled
0 commands currently queued
enabled debugging options: (abort) (reset)
queue status:
no not yet issued commands
no current command
no disconnected commands
waiting: SCSISEQ (); SCSISIG (DATA OUT); INTSTAT (lo); SSTAT (SWRAP BUSFREE
PHASECHG ); SSTAT (); SXFRCTL0 (CH1 ); SIGNAL (); SELID (81), SSTAT2
(SEMPTY ); SFCNT (0); SCSICNT (0), OFFCNT(0), SSTAT4 (); DMACNTRL0 (16BIT
PIO READ INTEN ); DMASTAT (DFIFOEMP )
enabled interrupts ()
Any ideas?
Lefty Kreouzis
--
E-Mail: E. Lefty Kreouzis <lefty@fage.gr>
Date: 27-Oct-99
Time: 10:10:39
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