On 11/18/2010 12:42 PM, Mark Kilty wrote: > Hi, > > I just noticed I did not Reply To All to John's email. Here is the content I wondered what happened to your response. > Hi John, > > Thanks for getting back to me. Its appreciated. > > To answer your questions: > > We have 2 issues with the driver we are using (it's the current driver from > Realtek, v1040). > 1) It loses connectivity after a "random" period of time. As in, > the unit will work fine for a while, and then, maybe after 20 minutes, 2 > hours, 8 hours, etc, it will stay connected to the AP, but the throughput is > brought to almost 0. When doing a simple ping to the access point, > sometimes it will go through, but most of the time it will timeout. We have > not been able to find a "pattern" as of yet as to when/why it drops. > 2) The overall performance of the chip under windows is better than > under Linux (more below). Realtek has stated something to be about not > supporting "high power" on linux, but am not 100% sure what that means as I > would have assumed this is a hardware thing, not a software thing. > > Our product is a long range WiFi system. We are working on a new product, > that integrates with the RTL8187L as this chip has proven to be the best > long-range Wifi card for b/g networks. There are other chips/WiFi adapters > on the market, but under Windows/Mac, this chip outperforms all of them. > For us, the distance we can connect is the most important factor. > Speed/throughput is secondary. > > I am certainly able to provide additional information with more specifics if > you are interested and we sign an NDA. > > We have been in contact with Realtek, but they have not been very responsive > (surprising for a company like this that is stating they support Linux, but > are doing so in a half-ass way (excuse my French :) )). So, I am very > actively trying to locate someone with driver experience that can work from > the Realtek drivers and diagnose and resolve the current issues we have, and > potentially any others in the future. > > Is this something you might be interested in? After a set of recent changes to rtl8187 that increased the throughput of the RTL8187B by about a factor of 2.5, I implemented the latest Realtek driver to see if it had any improvement over rtl8187 for the RTL8187L chip. It did not - in fact the performance went down. In exactly the same station/AP arrangement, the TX speed of rtl8187 was at least 1.5 times that of the vendor driver (1040). I also found it not to be able to maintain a stable connection, whereas rtl8187 can. Is there some reason for you to choose the vendor driver over rtl8187? If it is the kernel version, I should be able to help you with that. I am a little busy at the moment with drivers for some other Realtek devices. I am developing a good working relationship with their in-house developers, and working on mainline drivers for several 802.11n devices, but I might consider some extra work. If no one else has responded, please contact me off-list. Larry -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
