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IOGear's driver is flawed, use Keyspan USA-19QW
Authored by: dkwyman on Oct 15, '03 11:52:37AM

The IOGEAR product is based on the Prolific Tech PL2303 chip, as are a number of other USB-Serial adapters in the PC market. The IOGear of the driver for Mac OS X appear to be an adaptation of the Prolific Tech driver for Mac OS X and has the objectionable characteristic of generating numerous entries in the system log during operation. This clutters and grows the system log, generates a lot of disk access activity and reduces the performance of the serial connection. Here is a sample of the message (this is just a !short portion! of what was generated while HotSync'ing my Palm).

you will see <system name> as YOUR system name

Sep 26 20:32:04 <system_name> mach_kernel: oss8000005: dequeueData ret 3
Sep 26 20:32:04 <system_name> mach_kernel: ttyioss8000005: dequeueData ret 3
Sep 26 20:32:11 <system_name> last message repeated 188 times
Sep 26 20:32:12 <system_name> mach_kernel: oss8000005: dequeueData ret 3
Sep 26 20:32:12 <system_name> mach_kernel: ttyioss8000005: dequeueData ret 3
Sep 26 20:32:12 <system_name> last message repeated 24 times
Sep 26 20:32:13 <system_name> mach_kernel: 05: dequeueData ret 3
Sep 26 20:32:13 <system_name> mach_kernel: ttyioss8000005: dequeueData ret 3
Sep 26 20:32:13 <system_name> last message repeated 35 times
Sep 26 20:32:14 <system_name> mach_kernel: 05: dequeueData ret 3
Sep 26 20:32:14 <system_name> mach_kernel: ttyioss8000005: dequeueData ret 3
Sep 26 20:32:14 <system_name> last message repeated 22 times
Sep 26 20:32:16 <system_name> mach_kernel: 000005: dequeueData ret 3
Sep 26 20:32:16 <system_name> mach_kernel: ttyioss8000005: dequeueData ret 3
Sep 26 20:32:16 <system_name> last message repeated 40 times
Sep 26 20:32:17 <system_name> mach_kernel: oss8000005: dequeueData ret 3
Sep 26 20:32:17 <system_name> mach_kernel: ttyioss8000005: dequeueData ret 3
Sep 26 20:32:17 <system_name> mach_kernel: ttyioss8000005: dequeueData ret 3
Sep 26 20:32:18 <system_name> mach_kernel: 000005: dequeueData ret 3
Sep 26 20:32:18 <system_name> mach_kernel: ttyioss8000005: dequeueData ret 3
Sep 26 20:32:18 <system_name> last message repeated 66 times
Sep 26 20:32:19 <system_name> mach_kernel: 000005: dequeueData ret 3
Sep 26 20:32:19 <system_name> mach_kernel: ttyioss8000005: dequeueData ret 3
Sep 26 20:32:20 <system_name> last message repeated 139 times
(etc, etc, etc)

So far, IOGEAR tech support is in denial of this problem. Some others have reported the problem and some have offered hacks to overcome the problem. I cannot speak for the effectiveness of the driver hacks so I'll not endorse them here:

http://www.macosxhints.com/article.php?story=200309231754060

On the other hand:
The Keyspan USA-19QW does not exhibit this problem and is based on a differenct chip set and driver. I recommend the Keyspan solution.



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IOGear's driver is flawed, use Keyspan USA-19QW
Authored by: michaelkvance on Oct 15, '03 02:43:33PM

I use the Keyspan successfully with an ola Palm Vx.

m.

---
"Bought on stolen wine, oh a nod was the first step.
You knew very well, what was coming next."
-- The Smiths, I Don't Owe You Anything



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