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* K.R. Foley <kr@cybsft.com> wrote: > This is an interesting one. ~3.9ms generated here by amlat in do_IRQ: the overhead is not in do_IRQ(): > 00000001 0.000ms (+0.000ms): n_tty_receive_buf (pty_write) > 00010001 3.992ms (+3.992ms): do_IRQ (n_tty_receive_buf) the overhead is always relative to the previous entry - so the overhead was in n_tty_receive_buf() [that is the function that was interrupted by do_IRQ()]. But it's a bit weird - you should have gotten timer IRQs every 1 msec. Does n_tty_receive_buf() run with irqs disabled perhaps? Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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