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Date: Wed, 23 May 2012 19:12:08 -0700 From: Greg KH <greg@...ah.com> To: Joe Perches <joe@...ches.com> Cc: Alan Stern <stern@...land.harvard.edu>, Kay Sievers <kay@...y.org>, Kernel development list <linux-kernel@...r.kernel.org>, Jason Baron <jbaron@...hat.com>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: Excessive latency for dev_dbg? On Wed, May 23, 2012 at 01:45:03PM -0700, Joe Perches wrote: > cc'ing Kay. > > On Wed, 2012-05-23 at 16:37 -0400, Alan Stern wrote: > > I just tried doing some testing of 3.4. Sequences of literally > > adjacent dev_dbg() calls -- with local interrupts disabled -- show up > > in the log buffer spaced at time intervals between 1 and 4 > > milliseconds! > > > > This is with CONFIG_DYNAMIC_DEBUG not enabled, and CONFIG_PRINTK_TIME, > > CONFIG_PREEMPT, CONFIG_HIGH_RES_TIMERS, and CONFIG_HPET_TIMER all set > > to y. > > > > What's going on here? Did printk suddenly slow down a lot? Or has the > > timer code gone crazy? Joe, why ask Kay? He didn't touch this code until 3.5-rc1, and Alan is testing 3.4. confused, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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