Date: Sun, 14 Jan 2007 10:40:24 -0800 From: Sam Leffler <sam@errno.com> To: Trigve Siver <trigves@yahoo.com> Cc: freebsd-hardware@freebsd.org Subject: Re: DWL-G520 low signal, low speed Message-ID: <45AA7918.2020603@errno.com> In-Reply-To: <20070114142837.13776.qmail@web52714.mail.yahoo.com> References: <20070114142837.13776.qmail@web52714.mail.yahoo.com>
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Trigve Siver wrote: > Hi, > > One more thing I want to add is...that when I was using ath I have had low speed and also had a lot of interupts and I realised that ath was sharing IRQ with USB (IRQ 19 in my case)... so I disabled the USB and throw away ath from kernel and compile it as module (want to take some performance test with ndis and ath)...and after that I have still low signal but media is OFDM/54 Mbps and is stable... to the performance....I think that ndis is somehow a little faster...when dowloading/uploading about 100 kB/s faster...but haven't done some serious testing (don't know how maybe with kismet?) Downstream performance is mostly dependent on performance of the sender. 100 kB/s (kilobits?) is likely not significant which means the radio operation are likely similar. If you really want to compare what's going on collect a packet trace of both drivers and look at the tx rates and other characteristics. The interrupt rate you cited original is too high. I believe your card has on-chip counters for phy errors which means you should get only interrupts for real frames and that's typically max's out at ~4K/sec when running full out in both directions. More typical packet rates are <1K and there are some interrupt mitigiation techniques used to bring the interrupt rate lower than that. BTW top-posting means all context is lost when I reply; it is discouraged. Sam
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