Re: IOLog on serial port? Or to use kprintf?
Re: IOLog on serial port? Or to use kprintf?
- Subject: Re: IOLog on serial port? Or to use kprintf?
- From: Felix Kronlage <email@hidden>
- Date: Sun, 23 Jan 2005 15:47:54 +0100
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On Jan 22, 2005, at 21:22 Uhr, Justin Walker wrote:
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).
thanks for the info, Justin!
felix
- --
gpg-fingerprint: 076E 1E87 3E05 1C7F B1A0 8A48 0D31 9BD3 D9AC 74D0
http://fkr.hazardous.org | http://opendarwin.org/~fkr/
| FKR-RIPE
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (Darwin)
iD8DBQFB87kaDTGb09msdNARAnGZAJ46XQT9a26Pqd5sECfUQH7d18USNgCdFaBG
E5M+xYM4cpwZANUcC+2gjsg=
=/t/c
-----END PGP SIGNATURE-----
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Darwin-kernel mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden