Re: USB function on PXA270 - Slow ActiveSync transfers

Tech-Archive recommends: Fix windows errors by optimizing your registry

We are just wrapping up some performance work on the PXA270 USB driver
and have gotten approximately a 3x improvement in throughput with
various optimizations. Using DMA is foundational because the
programmed I/O version of the driver swamps the CPU with interrupts so
your CPU spends a significant portion of its time doing thread
switching vs. actually doing USB data transfer.

Mark Moeller
Qualnetics

.

Relevant Pages

  • Re: questions on 32 or 64 bit CPU etc
    ... anyone know how to determine, in Linux, if one's CPU is 32 or 64 bit? ... recognize external USB driver as soon as it was plugged in ... as in the case of 2 of my Iomega USB drivers however, ... any lights turn ...
    (Ubuntu)
  • Re: USB Over current Query ... ?
    ... What CPU? ... PXA? ... Can you change the USB driver? ... You just have to tell it not to use this indicator, ...
    (microsoft.public.windowsce.platbuilder)
  • DMA Buffer for USB Client Driver
    ... I'm using PXA27x and improving the speed of usb driver with DMA. ... Because a file copy from PDA to PC is too slow. ...
    (microsoft.public.windowsce.embedded)