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| 15:37.21 | KMus | idiot question time but is embedded linux, simply a custom build of linux with only the requires features / device drivers installed for a application and hardware board? |
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| 16:02.59 | mnemoc | KMus: please rephrase |
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| 17:06.28 | brainbox1100 | Hi. So we're running Debian Lenny to test an small app on an ARM9 250Mhz. Works well enough but it takes about 700ms to read 1K from the RS-232 and process it. On a Linux VM it takes 400ms. How do I track down the bottleneck? |
| 17:06.50 | brainbox1100 | CPU usage is not too high. Plenty of RAM. |
| 17:12.14 | gustavoz | what's the baud rate? |
| 17:15.46 | brainbox1100 | gustavoz: 115200. |
| 17:19.09 | gustavoz | the uart on your chip might be less than optimal, or the driver not very good at it |
| 17:19.37 | gustavoz | if you do some raw file transfer on the real hardware how high can you get? say with ymodem or zmodem |
| 17:28.55 | brainbox1100 | gustavoz: I can do that. It would help eliminate the RS232 as the problem. |
| 17:29.41 | gustavoz | brainbox1100: some arm chips have uarts that lack any useful fifo |
| 17:30.33 | gustavoz | brainbox1100: and some drivers lack dma capability, add those two up and you get a nice problem sustaining data rates and doing useful stuff |
| 17:39.28 | mnemoc | finally! nptl support got merged into uclibc's master |
| 17:39.36 | mnemoc | \o/ |
| 17:48.50 | wmat | mnemoc: hasn't that been progressing all month? |
| 17:51.25 | mnemoc | wmat: preparations... but the actual merge was like 20m ago |
| 17:51.32 | wmat | ah |
| 17:51.34 | mnemoc | now it's *done* :) |
| 17:51.43 | wmat | does it work? ;) |
| 17:51.56 | cmw | can anyone explain to me what gauging is.. in relation to a clock |
| 17:52.16 | mnemoc | wmat: hey! don't ruin the dream |
| 17:53.16 | wmat | heh |
| 17:53.17 | mnemoc | i'll give it until monday before testing, so landley has time to report regressions ;-) |
| 17:55.25 | wmat | cmw: what's the context? |
| 17:56.13 | mnemoc | cycles to real ns |
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| 18:01.30 | cmw | wmat: i'm adding locosto support to qemu and the it has some sort of guaging timer |
| 18:01.41 | cmw | seems omap ver 1 has something similar |
| 18:02.12 | wmat | it's just a measurement tool. Measures performance of something in clock ticks |
| 18:04.39 | wmat | at least that's my guess |
| 18:09.28 | cmw | yeah pain in the ass to debug without docs |
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