On Saturday 27 June 2009 11:30:07 David Brownell wrote: > > Pavel's explanation matches with what I remember about this issue. I'm > > preparing a test setup to verify the numbers just now. > > ISTR Nicolas Pitre reported almost-the-same-speed too. > > At least, on Linux. I believe MS-Windows does have a > speed difference, but that's not at issue here. > > - Dave
Here are my test results: Target: AT91SAM9260 on a Olimex SAM9-L9260 (ARM926EJ-S) JTAG: Amontec JTAG-Key OS: (K)Ubuntu 9.04 Host: Core2Duo @ 2.6 GHz OpenOCD: SVN 2405, built just an hour ago libftdi: /usr/lib/libftdi.so.1.13.0 (9.04 stock version) -------------------------------------------------------- > dump_image /home/vmaster/test.img 0x20000000 1048576 > dumped 1048576 byte in 43.130390s (24.311 KB/s) > arm7_9 fast_memory_access enable fast memory access is enabled > dump_image /home/vmaster/test.img 0x20000000 1048576 dumped 1048576 byte in 33.895313s (30.935 KB/s) > load_image /home/vmaster/test.img 0x20000000 bin 1048576 byte written at address 0x20000000 downloaded 1048576 byte in 12.915277s (81.188 KB/s) > arm7_9 dcc_downloads enable dcc downloads are enabled > load_image /home/vmaster/test.img 0x20000000 bin 1048576 byte written at address 0x20000000 downloaded 1048576 byte in 4.363197s (204.322 KB/s) libftdi: /usr/local/lib/libftdi.so.1.16.0 (--with-async-mode) ------------------------------------------------------------- > dump_image /home/vmaster/test.img 0x20000000 1048576 dumped 1048576 byte in 43.382168s (24.170 KB/s) > arm7_9 fast_memory_access enable fast memory access is enabled > dump_image /home/vmaster/test.img 0x20000000 1048576 dumped 1048576 byte in 34.004364s (30.836 KB/s) > load_image /home/vmaster/test.img 0x20000000 bin 1048576 byte written at address 0x20000000 downloaded 1048576 byte in 12.834919s (81.697 KB/s) > arm7_9 dcc_downloads enable dcc downloads are enabled > load_image /home/vmaster/test.img 0x20000000 bin 1048576 byte written at address 0x20000000 downloaded 1048576 byte in 4.368081s (240.054 KB/s) FTD2XX: /usr/local/lib/libftd2xx.so.0.4.13 ------------------------------------------ > dump_image /home/vmaster/test.img 0x20000000 1048576 dumped 1048576 byte in 41.470509s (25.284 KB/s) > arm7_9 fast_memory_access enable fast memory access is enabled > dump_image /home/vmaster/test.img 0x20000000 1048576 dumped 1048576 byte in 31.890425s (32.880 KB/s) > load_image /home/vmaster/test.img 0x20000000 bin 1048576 byte written at address 0x20000000 downloaded 1048576 byte in 14.818524s (70.761 KB/s) > arm7_9 dcc_downloads enable dcc downloads are enabled > load_image /home/vmaster/test.img 0x20000000 bin 1048576 byte written at address 0x20000000 downloaded 1048576 byte in 5.044282s (207.874 KB/s) These tests show libftdi ahead of ftd2xx or only very slightly behind. This is by no means a complete performance evaluation and the devil might be in the details, but I think it shows that these days libftdi is on par with ftd2xx, at least on Linux. The libftdi 1.13 that comes with (K)Ubuntu 9.04 is already compiled --with-- async-mode. I don't have an older version that lacks this feature lying around. Regards, Dominic
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