[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

slow transfers to a full-speed device

Subject: slow transfers to a full-speed device
From: Eric Smith <email@hidden>
Date: Tue, 14 Jun 2005 20:52:08 -0700
Delivered-to: email@hidden
Delivered-to: email@hidden

I've got a full speed USB device, and am writing data in 64 byte packets to a bulk endpoint. This is just sitting in a for loop, doing a bunch of WritePipe() calls. My download speed over several megabits is only about 500Kbps. I'm using Tiger, and a dual 1.8 G5. I get about the same performance on a G4 iBook running Tiger. The same USB device gets about 6Mbps download on a windows-based machine. I did not write the windows code, so I don't know any of the details of that implementation.

Any ideas or suggestions?

Thanks,
Eric Smith

_______________________________________________
Do not post admin requests to the list. They will be ignored.
Usb mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/usb/email@hidden

This email sent to email@hidden

Follow-Ups:
- Re: slow transfers to a full-speed device
  - From: Florent Pillet <email@hidden>
- Re: slow transfers to a full-speed device
  - From: David Ferguson <email@hidden>
- Re: slow transfers to a full-speed device
  - From: Fernando Urbina <email@hidden>

Prev by Date: Re: mouse driver
Next by Date: Re: slow transfers to a full-speed device
Previous by thread: Re: Can't seem to get USB logging to work [solved]
Next by thread: Re: slow transfers to a full-speed device
Index(es):
- Date
- Thread

Home