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From: Michael Smith <msmith@atrad.adelaide.edu.au>
Message-Id: <199707300348.NAA17840@genesis.atrad.adelaide.edu.au>
Subject: Re: code talks:  announcing EIDE bus master patches
In-Reply-To: <199707290509.BAA23557@smoke.marlboro.vt.us> from john hood at "Jul 29, 97 01:09:40 am"
To: cgull@smoke.marlboro.vt.us (john hood)
Date: Wed, 30 Jul 1997 13:18:29 +0930 (CST)
Cc: cgull@smoke.marlboro.vt.us, sos@sos.freebsd.dk,
        msmith@atrad.adelaide.edu.au, freebsd-current@FreeBSD.ORG
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john hood stands accused of saying:
> "but it works fine for me!"
> 
> for the rest of you:
> 
>   http://smoke.marlboro.vt.us/pub/cgull/starBSD/sff8038/

Works pretty well here too.  I picked up Soren's commit as soon as it hit
the repo.

CPU: Pentium Pro (199.42-MHz 686-class CPU)
 Origin = "GenuineIntel"  Id = 0x619  Stepping=9
 Features=0xfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV>
real memory  = 16777216 (16384K bytes)
avail memory = 14647296 (14304K bytes)
...
ide_pci0: <Intel PIIX3 Bus-master IDE controller> rev 0x00 on pci0.7.1
...
wdc0 at 0x1f0-0x1f7 irq 14 flags 0xa0ffa0ff on isa
wdc0: unit 0 (wd0): <IBM-DAQA-33240>, DMA, 32-bit, multi-block-16
wd0: 3098MB (6346368 sectors), 6296 cyls, 16 heads, 63 S/T, 512 B/S

Without DMA enabled :

 # dd if=/dev/rwd0 of=/dev/null bs=1m count=200
 209715200 bytes transferred in 30.751826 secs (6819602 bytes/sec)
 systat -vmstat excerpt :
  1.2%Sys  81.0%Intr  0.2%User  0.0%Nice 17.6%Idl 

With DMA enabled :

 # dd if=/dev/rwd0 of=/dev/null bs=1m count=200
 209715200 bytes transferred in 31.191724 secs (6723424 bytes/sec)
 systat -vmstat excerpt :
  1.1%Sys   0.3%Intr  0.2%User  0.0%Nice 98.4%Idl

No more throughput, but all of a sudden I have a CPU again.  Lovely!

-- 
]] Mike Smith, Software Engineer        msmith@gsoft.com.au             [[
]] Genesis Software                     genesis@gsoft.com.au            [[
]] High-speed data acquisition and      (GSM mobile)     0411-222-496   [[
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]] Unix hardware collector.             "Where are your PEZ?" The Tick  [[