Re: CONFIG_PRINTK_TIME woes

From: Jason Uhlenkott (jasonuhl_at_sgi.com)
Date: 08/22/05

  • Next message: Adrian Bunk: "[-mm patch] DLM must depend on SYSFS" 
    Date:	Mon, 22 Aug 2005 13:33:06 -0700
To: "David S. Miller" <davem@davemloft.net>

    On Mon, Aug 22, 2005 at 01:20:52PM -0700, David S. Miller wrote:
    > From: tony.luck@intel.com
    > Date: Mon, 22 Aug 2005 10:42:22 -0700
    >
    > > At the other extreme ... the current use of sched_clock() with
    > > potentially nano-second resolution is way over the top.
    >
    > Not really, when I'm debugging TCP events over gigabit
    > these timestamps are exceptionally handy.

    Yes, but how many of those figures are really significant? I strongly
    suspect that the overhead of printk() is high enough, even when we're
    just spewing to the dmesg buffer and not the console, that we have a
    lot more precision than accuracy at nanosecond resolution.
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