From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <70c5a0235128a534fa24ca9c28cce7e2@quanstro.net>
From: erik quanstrom <quanstro@quanstro.net>
Date: Sat, 29 Apr 2006 16:39:43 -0500
To: 9fans@cse.psu.edu
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Subject: [9fans] nvidia scrolling performance
Topicbox-Message-UUID: 4b26f686-ead1-11e9-9d60-3106f5b1d025

i've been using 1280x1024x32 on an nv18 with a greyscale font.
graphics performance is good.  page is able to pan large images
smoothly.  however, for a ~1000x750 window, i get these numbers
with various other load on the system:

	0.00u 0.00s 49.32r 	 cat /sys/games/lib/fortunes		# system is idle
	0.00u 0.00s 50.29r 	 cat /sys/games/lib/fortunes		# load avg of ~ 0.5
	0.00u 0.00s 50.71r 	 cat /sys/games/lib/fortunes		# load avg of ~ 0.9
	0.00u 0.01s 63.46r 	 cat /sys/games/lib/fortunes		# load avg > 1

running the same test with pelm.8, i get

	0.00u 0.00s 1.08r 	 cat /sys/games/lib/fortunes

the only obvious difference i see between the plan 9 driver and the xf86 stuff is
that the xf86 stuff tries to buffer dma access a bit.  is ths the key, or should i be looking
at something else?

- erik