From: Chris Friesen <cfriesen@nortelnetworks.com>
To: "Perez-Gonzalez, Inaky" <inaky.perez-gonzalez@intel.com>
Cc: george@mvista.com, root@chaos.analogic.com, "Brown,
Len" <len.brown@intel.com>,
Tim Schmielau <tim@physik3.uni-rostock.de>,
john stultz <johnstul@us.ibm.com>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: gradual timeofday overhaul
Date: Thu, 21 Oct 2004 16:36:38 -0600 [thread overview]
Message-ID: <417839F6.7090308@nortelnetworks.com> (raw)
In-Reply-To: <F989B1573A3A644BAB3920FBECA4D25A011F96DC@orsmsx407>
Perez-Gonzalez, Inaky wrote:
> Now, the ugly case would be if number_of_context_swiches_per_second > HZ.
> In HZ = 100, this could be happening, but in HZ=1000, in a single CPU
> ...well, that would be TOO weird [of course, a real-time app with a
> 1ms period would do that, but it'd require at least an HZ of 10000 to
> work more or less ok and we'd be below the watermark].
It's easy to have >>1000 context switches per second on a server. Consider a
web server that receives a network packet, issues a request to a database, hands
some work off to a thread so the main app doesn't block, then sends a response.
That could be a half dozen context switches per packet. If you have 20000
packets/sec coming in....
Chris
next prev parent reply other threads:[~2004-10-21 22:51 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-21 21:32 Perez-Gonzalez, Inaky
2004-10-21 22:36 ` Chris Friesen [this message]
2004-10-22 0:21 ` George Anzinger
-- strict thread matches above, loose matches on Subject: below --
2004-10-22 0:29 Perez-Gonzalez, Inaky
2004-10-21 8:32 Perez-Gonzalez, Inaky
2004-10-21 21:17 ` George Anzinger
2004-10-21 22:40 ` Chris Friesen
2004-10-25 23:12 ` George Anzinger
2004-10-25 23:51 ` Chris Friesen
2004-10-19 18:21 process start time set wrongly at boot for kernel 2.6.9 Jerome Borsboom
2004-10-19 20:11 ` john stultz
2004-10-20 0:42 ` Tim Schmielau
2004-10-20 0:59 ` john stultz
2004-10-20 3:05 ` gradual timeofday overhaul Tim Schmielau
2004-10-20 7:47 ` Len Brown
2004-10-20 15:09 ` George Anzinger
2004-10-20 15:59 ` Richard B. Johnson
2004-10-20 15:17 ` George Anzinger
2004-10-20 17:09 ` Lee Revell
2004-10-20 21:42 ` Len Brown
2004-10-20 18:13 ` john stultz
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