From owner-freebsd-stable  Fri Jun 11 15:23:54 1999
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Date: Fri, 11 Jun 1999 18:22:51 -0400 (EDT)
From: Seth <seth@freebie.dp.ny.frb.org>
Subject: xperfmon++ and softupdates?
To: freebsd-stable@freebsd.org
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I've noticed something a bit interesting, and wonder whether someone could
confirm:

I use xperfmon++ to monitor disk i/o (among other things).  I've noticed
that it seems to report disk activity without softupdates, but doesn't
really show the effects of large copies WITH softupdates.  For example, a
copy of a 300 MB file will cause a spike in "Disk IO (Mbytes/s)" when
softupdates is off, but with softupdates on, there's no change.

It's not an urgent problem, but I am curious.  Comments?

[ Dunno whether it's relevant, but: 
ahc0: <Adaptec aic7890/91 Ultra2 SCSI adapter> rev 0x00 int a irq 18 on
pci2.10.
0
ahc0: aic7890/91 Wide Channel A, SCSI Id=7, 16/255 SCBs
ahc1: <Adaptec aic7880 Ultra SCSI adapter> rev 0x01 int a irq 18 on
pci2.14.0
ahc1: aic7880 Wide Channel A, SCSI Id=7, 16/255 SCBs
sa0 at ahc1 bus 0 target 6 lun 0
sa0: <ARCHIVE Python 04106-XXX 715G> Removable Sequential Access SCSI-2
device 
sa0: 10.000MB/s transfers (10.000MHz, offset 15)
da0 at ahc0 bus 0 target 0 lun 0
da0: <SEAGATE ST39102LW 0004> Fixed Direct Access SCSI-2 device 
da0: 80.000MB/s transfers (40.000MHz, offset 15, 16bit), Tagged Queueing
Enabled
da0: 8683MB (17783240 512 byte sectors: 255H 63S/T 1106C)
da1 at ahc0 bus 0 target 1 lun 0
da1: <SEAGATE ST39102LW 0004> Fixed Direct Access SCSI-2 device 
da1: 80.000MB/s transfers (40.000MHz, offset 15, 16bit), Tagged Queueing
Enabled
da1: 8683MB (17783240 512 byte sectors: 255H 63S/T 1106C)
]

Thanks,

SB



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