On 07/02/2011, at 23:36, Ivan Voras wrote: >> OK, I wrote the data to /dev/null from USB and ran diskutil in a loop and it >> doesn't drop out. > > Maybe I misunderstood you and it's a different problem than what I was > experiencing; is this a better description of your problem: > > 1) you have a program communicating with a USB device > 2) it reads from the device and writes to a file > 3) you experience stalls when you write the data recived from the USB > device to the file but only if the file system you're writing on is > also loaded by something else - heavy reads? > > ?
Yes, however CPU loading also seems to affect it. Unfortunately I don't have a useful measurement to show the problem - ie I don't have a metric which correlates with the hardware FIFO filling up. This makes the testing rather annoying :) -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
