x in om2007.2

Andy Green andy at openmoko.com
Sun Jul 27 17:28:16 CEST 2008

Hash: SHA1

Somebody in the thread at some point said:

|> Why is this so (lesser memory bandwidth due to the glamo chip)?
| because that is the nature of the hardware on the freerunner. the glamo
| throttles write rates to its video ram (or read rates) and thus brings the
| system into wait states waiting on the glamo (basically lock in your
cpu down to
| doing nothing WHILE you try and write data, and the writes do not go
as fast
| asht e cpu can manage - they hit about 7mb/sec - thats a fair bit less
| your average 100mbit ethernet can transport, and thats the video memory
| access from the cpu). it's just that is how it is, and it is a limit
you have to
| code around - read/write less data to/from video ram on updates.

Just a FYI, I have a pair of patches pending that claim to increase
throughput to Glamo without introducing new instability, and it is
possible to crank it up a bit more I think.

- -Andy
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