Date: Sun, 3 May 1998 09:33:47 -0700 (PDT) From: Matthew Dillon <dillon@backplane.com> To: Nate Williams <nate@mt.sri.com> Cc: freebsd-bugs@FreeBSD.ORG Subject: Re: i386/5398 Message-ID: <199805031633.JAA04427@apollo.backplane.com>
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:In short, it's only partially FreeBSD's problem. It's FreeBSD problems
:because ultimately it makes FreeBSD look bad, but in reality this
:problem is one in XFree86. Note, I've heard that newer versions of
:XFree86 do things better/differently? Are you using the most recent
:version of XFree86? Are you using a video card that tends to hog the
:PCI bus because it's cranked way up?
:
:These are the *most* likely scenaries that will cause overflows on your
:hardware based on my own personal experience.
:
:This is not an affront to your intelligence or your time, just
:observations based on direct experience with FreeBSD and X with similar
:behavior.
:
:
:Nate
How is XFree86, a userland program, able to disable interrupts ?
The Hardware blitter/PCI latency also seems impossible, 115200 =
11.5 KBytes/sec = 86uS per character x the FIFO depth (after the hack)
of 4 or 8 character times is over 500uS. It just doesn't make any
sense.
-Matt
Matthew Dillon Engineering, BEST Internet Communications, Inc.
<dillon@backplane.com>
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