From: Matt Pidd-Cheshire <axwrt001@yahoo.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] NOW it's like lightning
Date: Tue, 8 Jun 2004 18:46:04 -0700 [thread overview]
Message-ID: <40C66BDC.6070301@yahoo.com> (raw)
Rob Pike perceptively observed :
> i wonder if you have DMA turned off on your disk.
> also, i've known CPUs to disable their caches
> sometimes. is the machine healthy when running
> other programs?
it seemed like a worthwhile wheeze ...
echo 'dma on' > /dev/sdC0/ctl
echo 'dma on' > /dev/sdD0/ctl
and Bling! Comparable speed!
My hat is raised to you sir.
In fact that brings to mind a thought ... does this
DMA business also apply to the ether drivers - as this
would explain the ~250Kb/sec transfer Plan 9 <-> BSD
versus the 2.5Mb/sec transfer WindazXP <-> BSD ...
and begs the question, pray why might these be off
by default ... ?
and since this is a job-lot; can ftpfs operate in a mode
where it doesn't first make a local copy of a file to ship
across the link but instead reads the file itself ?
many thanks
next reply other threads:[~2004-06-09 1:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-09 1:46 Matt Pidd-Cheshire [this message]
2004-06-09 1:56 ` Geoff Collyer
2004-06-09 2:18 ` Geoff Collyer
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