From: Ingo Molnar <mingo@elte.hu>
To: Luming Yu <luming.yu@gmail.com>
Cc: Arjan van de Ven <arjan@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
suresh.b.siddha@intel.com, venkatesh.pallipadi@intel.com,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [RFC patch] Use IPI_shortcut for lapic timer broadcast
Date: Mon, 29 Jun 2009 11:15:28 +0200 [thread overview]
Message-ID: <20090629091528.GB9724@elte.hu> (raw)
In-Reply-To: <3877989d0906290143y3b5306f4s4a990ecbfbfc49b6@mail.gmail.com>
* Luming Yu <luming.yu@gmail.com> wrote:
> Please note this is deep-C-state related. C state does add extra
> latency.. but I don't know how much...
ok, so if each of the CPUs has to be brought out of deep-C and with
each one 50-100 usecs a pop one could see the total time taking more
than 1000 usecs. That would explain the hang.
Ingo
next prev parent reply other threads:[~2009-06-29 9:15 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-29 6:47 [RFC patch] Use IPI_shortcut for lapic timer broadcast Luming Yu
2009-06-29 7:20 ` Ingo Molnar
2009-06-29 8:04 ` Luming Yu
2009-06-29 8:16 ` Ingo Molnar
2009-06-29 8:21 ` Luming Yu
2009-06-29 8:30 ` Ingo Molnar
2009-06-29 8:43 ` Luming Yu
2009-06-29 9:15 ` Ingo Molnar [this message]
2009-06-29 14:01 ` Arjan van de Ven
2009-06-29 20:34 ` Pallipadi, Venkatesh
2009-06-30 7:01 ` Luming Yu
2009-07-03 0:23 ` Pallipadi, Venkatesh
2009-07-03 2:04 ` Luming Yu
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