Re: [ath9k-devel] Significiant performance differences between ath5k and ath9k in 802.11a
Luis, with several people confirming the performance regression relative to AR5xxx/ath5k, can you tell us whether this will eventually be fixed? We are close to a purchase decision and would really like to upgrade to a recent chip set. -- Regards Joerg --- Felix Fietkau schrieb am Fr, 29.1.2010: > Von: Felix Fietkau > Betreff: Re: [ath9k-devel] Significiant performance differences between ath5k > and ath9k in 802.11a > An: "Joerg Pommnitz" > CC: rootki...@yahoo.it, linux-wirel...@vger.kernel.org, > ath9k-devel@lists.ath9k.org, ath5k-de...@lists.ath5k.org > Datum: Freitag, 29. Januar 2010, 9:23 > On 2010-01-29 9:10 AM, Joerg Pommnitz > wrote: > > --- rootki...@yahoo.it > > wrote: > > > >> > >> Can you try in AP-client mode? I think you'll get > more > >> throughput so. > >> > > > > No, IBSS is what I'm interested in. And the point is, > that there is > > a 30% performance difference between ath5k (and > Madwifi) and ath9k. Even > > if the performance in AP mode would be better, this > does not change the > > problem in IBSS mode. > I can confirm these numbers for AP/Client mode as well. > I've even tested > legacy communication between ath9k ap and sta, producing > the same > result. Additionally, I can rule out the rate control > algorithm, as > using minstrel instead of the ath9k RC produces a very > similar > throughput test result. > > - Felix > __ Do You Yahoo!? Sie sind Spam leid? Yahoo! Mail verfügt über einen herausragenden Schutz gegen Massenmails. http://mail.yahoo.com ___ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
Re: [ath9k-devel] Significiant performance differences between ath5k and ath9k in 802.11a
Your numbers for ath9k in the 5GHz band jibe with what I've observed for the ar9170 in ad-hoc mode. If you go down to 2.4GHz you'll see about 16MBit/s. I have no other numbers to offer for comparison. --Adam Joerg Pommnitz wrote: > Hello all, > I have a strange performance problem with ath9k. I have two otherwise > identical systems with an ath5k-supported card in system ATH5K and an ath9k > supported card in system ATH9K. > Doing an UDP iperf run were ATH5K is the client/sender and ATH9K is the > server/receiver I easily get data rates of 31MBit/s (tx data rate on the > sender is manually set to 54 MBit/s). > Running the same test with ATH9K as client/sender and ATH5K as > server/receiver gives maximum data rates of about 22MBit/s, about 30% less. > > Doing the test against another ath9k system (e.g. ATH9K ==> ATH9K2) gives > the same max data rate of only 22 MBit/s, so the problem seems to be the > ath9k driver or the hardware. Can anybody confirm these problems? Is this > a known limitation? Any buttons to push to get things going faster? > > Details: > the ath5k card is a AR2413 based design (Compex WLM54AG), the ath9k card > is a AR9220 (Compex WLM200NX 6A). The systems are connected in IBSS mode > on channel 40 (5200MHz). > The kernel version is wireless-testing as of January, 26. The kernel is > slightly patched to enable IBSS in 802.11a (we are allowed to do this). > > Can anybody shed some light on this strange issue? Luis? > > ___ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
Re: [ath9k-devel] Significiant performance differences between ath5k and ath9k in 802.11a
2010/1/29 Felix Fietkau : > On 2010-01-29 9:10 AM, Joerg Pommnitz wrote: >> --- rootki...@yahoo.it wrote: >> >>> >>> Can you try in AP-client mode? I think you'll get more >>> throughput so. >>> >> >> No, IBSS is what I'm interested in. And the point is, that there is >> a 30% performance difference between ath5k (and Madwifi) and ath9k. Even >> if the performance in AP mode would be better, this does not change the >> problem in IBSS mode. > I can confirm these numbers for AP/Client mode as well. I've even tested > legacy communication between ath9k ap and sta, producing the same > result. Additionally, I can rule out the rate control algorithm, as > using minstrel instead of the ath9k RC produces a very similar > throughput test result. > > - Felix > -- > To unsubscribe from this list: send the line "unsubscribe linux-wireless" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Hi all, I can confirm the problem too, I obtained the same kind of performance in AP/STA mode and injecting packet directly from kernel space using a VAP in monitor mode. In each test I carried out I reached a maximum throughput of ~ 35Mbps while the Iperf client was transmitting ~ 80Mbps with MCS 15. Regards Lorenzo ___ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
Re: [ath9k-devel] Significiant performance differences between ath5k and ath9k in 802.11a
On 2010-01-29 9:10 AM, Joerg Pommnitz wrote: > --- rootki...@yahoo.it wrote: > >> >> Can you try in AP-client mode? I think you'll get more >> throughput so. >> > > No, IBSS is what I'm interested in. And the point is, that there is > a 30% performance difference between ath5k (and Madwifi) and ath9k. Even > if the performance in AP mode would be better, this does not change the > problem in IBSS mode. I can confirm these numbers for AP/Client mode as well. I've even tested legacy communication between ath9k ap and sta, producing the same result. Additionally, I can rule out the rate control algorithm, as using minstrel instead of the ath9k RC produces a very similar throughput test result. - Felix ___ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
Re: [ath9k-devel] Significiant performance differences between ath5k and ath9k in 802.11a
--- rootki...@yahoo.it wrote: > > Can you try in AP-client mode? I think you'll get more > throughput so. > No, IBSS is what I'm interested in. And the point is, that there is a 30% performance difference between ath5k (and Madwifi) and ath9k. Even if the performance in AP mode would be better, this does not change the problem in IBSS mode. Regards Joerg __ Do You Yahoo!? Sie sind Spam leid? Yahoo! Mail verfügt über einen herausragenden Schutz gegen Massenmails. http://mail.yahoo.com ___ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
Re: [ath9k-devel] Significiant performance differences between ath5k and ath9k in 802.11a
On Thu, Jan 28, 2010 at 4:13 PM, Joerg Pommnitz wrote: > Hello all, > I have a strange performance problem with ath9k. I have two otherwise > identical systems with an ath5k-supported card in system ATH5K and an ath9k > supported card in system ATH9K. > Doing an UDP iperf run were ATH5K is the client/sender and ATH9K is the > server/receiver I easily get data rates of 31MBit/s (tx data rate on the > sender is manually set to 54 MBit/s). > Running the same test with ATH9K as client/sender and ATH5K as > server/receiver gives maximum data rates of about 22MBit/s, about 30% less. > > Doing the test against another ath9k system (e.g. ATH9K ==> ATH9K2) gives > the same max data rate of only 22 MBit/s, so the problem seems to be the > ath9k driver or the hardware. Can anybody confirm these problems? Is this > a known limitation? Any buttons to push to get things going faster? > > Details: > the ath5k card is a AR2413 based design (Compex WLM54AG), the ath9k card > is a AR9220 (Compex WLM200NX 6A). The systems are connected in IBSS mode > on channel 40 (5200MHz). > The kernel version is wireless-testing as of January, 26. The kernel is > slightly patched to enable IBSS in 802.11a (we are allowed to do this). > > Can anybody shed some light on this strange issue? Luis? > > -- > Regards > Joerg > > __ > Do You Yahoo!? > Sie sind Spam leid? Yahoo! Mail verfügt über einen herausragenden Schutz > gegen Massenmails. > http://mail.yahoo.com > ___ > ath9k-devel mailing list > ath9k-devel@lists.ath9k.org > https://lists.ath9k.org/mailman/listinfo/ath9k-devel > Can you try in AP-client mode? I think you'll get more throughput so. ___ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
[ath9k-devel] Significiant performance differences between ath5k and ath9k in 802.11a
Hello all, I have a strange performance problem with ath9k. I have two otherwise identical systems with an ath5k-supported card in system ATH5K and an ath9k supported card in system ATH9K. Doing an UDP iperf run were ATH5K is the client/sender and ATH9K is the server/receiver I easily get data rates of 31MBit/s (tx data rate on the sender is manually set to 54 MBit/s). Running the same test with ATH9K as client/sender and ATH5K as server/receiver gives maximum data rates of about 22MBit/s, about 30% less. Doing the test against another ath9k system (e.g. ATH9K ==> ATH9K2) gives the same max data rate of only 22 MBit/s, so the problem seems to be the ath9k driver or the hardware. Can anybody confirm these problems? Is this a known limitation? Any buttons to push to get things going faster? Details: the ath5k card is a AR2413 based design (Compex WLM54AG), the ath9k card is a AR9220 (Compex WLM200NX 6A). The systems are connected in IBSS mode on channel 40 (5200MHz). The kernel version is wireless-testing as of January, 26. The kernel is slightly patched to enable IBSS in 802.11a (we are allowed to do this). Can anybody shed some light on this strange issue? Luis? -- Regards Joerg __ Do You Yahoo!? Sie sind Spam leid? Yahoo! Mail verfügt über einen herausragenden Schutz gegen Massenmails. http://mail.yahoo.com ___ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
