On Sat, Nov 23, 2002 at 12:14:23AM -0800, Thomas Zimmerman wrote: > > Yes, this is the sort of anecdotal 'evidence' that is of no use > > whatsoever. Most of the time it turns out to be a matter of local > > system configuration. IDE DMA is one of the bigger culprits here. > > Is it really? I tweeked debain on this box untill it hurt. I was slowly > replaceing everything by hand to compile it with decent optimizations. > As a user, forcing build changes is hard even with apt-get source (and > apt-src). Beleive me, this is much more then turning on IDE DMA.
Turning on IDE DMA is a performance improvement of around a factor of 6-10 (2-3Mb/sec -> 25-40Mb/sec), for disk-bound operations. You can get *more* than a 6-times improvement in performance? > Under > debian's X/glibc/kde I can't move windows with contents without > 'tearing.' Something is seriously wrong, most likely with your display driver. You should be able to achieve this on a 486, albeit at a lower resolution. > X is CPU bound if you can't > move windows smoothly because it has latency that is too high. Moving windows around is a memory-to-framebuffer-throughput-bound operation, not a CPU-bound one (unless your processor is really slow and your resolution is absurdly high). -- .''`. ** Debian GNU/Linux ** | Andrew Suffield : :' : http://www.debian.org/ | Dept. of Computing, `. `' | Imperial College, `- -><- | London, UK
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