Mailing Lists: Apple Mailing Lists
Image of Mac OS face in stamp
 
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: IOLog on serial port? Or to use kprintf?

Following up on my own post:
	
On Jan 21, 2005, at 18:03, Justin Walker wrote:

On Jan 21, 2005, at 16:00, Parav Pandit wrote:

Hi,
Currently I see my IOLog() messages in to the
/var/log/system.log file.

[snip]

FYI, if you do succeed in getting kprintf output directed to a serial port (cf. mail from Markus and Felix in this thread), be aware that using it will noticeably degrade the performance of your system (the last I looked, kprintf() uses polling to output to its device, and for serial, that means "forever" with interrupts disabled).

The last time I used kprintf to serial posts (when I was young, and there was Rhapsody in the air), it degraded the performance of the ethernet driver/network stack by about 90% (I was debugging the stack).

Regards,

Justin

--
Justin C. Walker, Curmudgeon-At-Large *
Institute for General Semantics | It's not whether you win or lose...
| It's whether *I* win or lose.
*--------------------------------------*-------------------------------*

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

This email sent to email@hidden
References: 
 >IOLog on serial port? Or to use kprintf? (From: Parav Pandit <email@hidden>)
 >Re: IOLog on serial port? Or to use kprintf? (From: Justin Walker <email@hidden>)



Visit the Apple Store online or at retail locations.
1-800-MY-APPLE

Contact Apple | Terms of Use | Privacy Policy

Copyright © 2007 Apple Inc. All rights reserved.