If you want to read about the Microsoft bug... http://support.microsoft.com/kb/2450963/en-US
As you see, there is no real fix at this time. The workaround is not very applicable for FLEX-x000 radios since 99% of the data stream is "meaningful" (isochronous data). -Tim -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Tim Ellison Sent: Saturday, April 30, 2011 3:58 PM To: Gary Keating; [email protected] Subject: Re: [Flexradio] CPU load for Firewire Hopefully the Firewire vendor will be able to achieve a more stable and standardized configuration. The problem is that there is a serious bug in the Microsoft Win7 1394 Firewire bus driver. Without going into much detail, it generates way too many ISR and DPC events when data is transferred on the 1394 bus. This generates a lot of interrupt overhead and extra CPU utilization for a data streaming process; neither are good. The Firewire vendor has been working with Microsoft to get them to fix the bug, but so far getting Micro$oft to fix it has been challenging. The interim workaround is to use the legacy (Vista) driver, which seems to help in most cases. -Tim -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Gary Keating Sent: Saturday, April 30, 2011 3:15 PM To: [email protected] Subject: [Flexradio] CPU load for Firewire Thank guys. I probably saw that info at some time but I needed to be led by the hand back to the solution. CPU load with no apps running is back to the 4% I saw with XP. Gary ND9Z _______________________________________________ FlexRadio Systems Mailing List [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ _______________________________________________ FlexRadio Systems Mailing List [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ _______________________________________________ FlexRadio Systems Mailing List [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
