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RE: [linrad] FFT performance
Hi, Edson!
How about posting a listing of ALL of your parameters to the list?
What is your sampling rate? Did you check out Leif's page on hardware
performance?
Its at
http://ham.te.hik.se/homepage/sm5bsz/linuxdsp/fft1time/fft1time.htm
This is what Leif got with a 650 MHz Pentium III:
SM 5 BSZ - First FFT timing for a large system using Pentium III
(Coppermine) at 650MHz
(Dec 30 2000)
------------------------------------------------------------------------
--------
Sampling rate = 96kHz.
No of A/D channels = 4.
No of RF channels = 2.
Useful bandwidth 2 x 90 kHz.
SIZE = 32768 16 bit no window, bandwidth 1.46Hz
Vers Name Time
0 Radix 2 DIF C 37.15%
1 Radix 2 DIF ASM 34.95%
2 Twin Radix 2 ASM 41.75%
3 Radix 4 DIT C 33.92%
4 Twin radix 4 DIT C 33.10%
5 Twin radix 4 DIT SIMD 26.10%
Typical operation
SIZE = 8192 32 bit sin squared window, bandwidth 23Hz
Vers Name Time
0 Radix 2 DIF C 24.01%
1 Radix 2 DIF ASM 22.06%
2 Twin Radix 2 ASM 20.17%
3 Radix 4 DIT C 22.87%
4 Twin radix 4 DIT C 19.70%
5 Twin radix 4 DIT SIMD 14.70%
-------------------------------------
If we can all see all of your parameters, maybe we can help.
73,
Roger Rehr
W3SZ FN20ah
2 Merrymount Road
Reading, PA 19609-1718
http://www.qsl.net/w3sz
> -----Original Message-----
> From: owner-linrad@xxxxxxxxxxxxxxxxxxxxx
> [mailto:owner-linrad@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Edson Pereira
> Sent: Thursday, November 14, 2002 10:00 AM
> To: linrad@xxxxxxxxxxxxxxxxxxxxx
> Subject: [linrad] FFT performance
>
>
>
> Greetings!
>
> I'm trying to run linrad on a new system and during the
> initial calibration linrad keeps telling me that the system
> is not fast enough and asks me to try to use less demanding
> FFTs. No matter how I change the values for the FFT
> paramenters (CW bandwidth for an I/Q direct conversion
> receiver), the result is always the same.
>
> The system is a PIII 1.2 GHz with 512 MB of RAM and a
> soundcard with a
> C-Media CMI9738 chipset. The soundcard works fine with other
> applications.
> The kernel module is the OSS free cmpci.o.
>
> Any suggestions?
>
> 73,
>
> -- Edson, 7n4ncl
>
>
Hi, Edson!
How about posting a listing of ALL of your parameters to the list?
What is your sampling rate? Did you check out Leif's page on hardware
performance?
Its at
http://ham.te.hik.se/homepage/sm5bsz/linuxdsp/fft1time/fft1time.htm
This is what Leif got with a 650 MHz Pentium III:
SM 5 BSZ - First FFT timing for a large system using Pentium III
(Coppermine) at 650MHz
(Dec 30 2000)
------------------------------------------------------------------------
--------
Sampling rate = 96kHz.
No of A/D channels = 4.
No of RF channels = 2.
Useful bandwidth 2 x 90 kHz.
SIZE = 32768 16 bit no window, bandwidth 1.46Hz
Vers Name Time
0 Radix 2 DIF C 37.15%
1 Radix 2 DIF ASM 34.95%
2 Twin Radix 2 ASM 41.75%
3 Radix 4 DIT C 33.92%
4 Twin radix 4 DIT C 33.10%
5 Twin radix 4 DIT SIMD 26.10%
Typical operation
SIZE = 8192 32 bit sin squared window, bandwidth 23Hz
Vers Name Time
0 Radix 2 DIF C 24.01%
1 Radix 2 DIF ASM 22.06%
2 Twin Radix 2 ASM 20.17%
3 Radix 4 DIT C 22.87%
4 Twin radix 4 DIT C 19.70%
5 Twin radix 4 DIT SIMD 14.70%
-------------------------------------
If we can all see all of your parameters, maybe we can help.
73,
Roger Rehr
W3SZ FN20ah
2 Merrymount Road
Reading, PA 19609-1718
http://www.qsl.net/w3sz
> -----Original Message-----
> From: owner-linrad@xxxxxxxxxxxxxxxxxxxxx
> [mailto:owner-linrad@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Edson Pereira
> Sent: Thursday, November 14, 2002 10:00 AM
> To: linrad@xxxxxxxxxxxxxxxxxxxxx
> Subject: [linrad] FFT performance
>
>
>
> Greetings!
>
> I'm trying to run linrad on a new system and during the
> initial calibration linrad keeps telling me that the system
> is not fast enough and asks me to try to use less demanding
> FFTs. No matter how I change the values for the FFT
> paramenters (CW bandwidth for an I/Q direct conversion
> receiver), the result is always the same.
>
> The system is a PIII 1.2 GHz with 512 MB of RAM and a
> soundcard with a
> C-Media CMI9738 chipset. The soundcard works fine with other
> applications.
> The kernel module is the OSS free cmpci.o.
>
> Any suggestions?
>
> 73,
>
> -- Edson, 7n4ncl
>
>
LINRADDARNIL