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From: Nivedita Singhvi <niv@us.ibm.com>
To: Don Fry <brazilnut@us.ibm.com>
Cc: Xen-devel@lists.xensource.com
Subject: Re: [PATCH] per-cpu timer changes
Date: Thu, 26 May 2005 11:03:52 -0700	[thread overview]
Message-ID: <42960F88.9020301@us.ibm.com> (raw)
In-Reply-To: <20050526173457.GA4725@us.ibm.com>

Don Fry wrote:

> The time going backwards was only occasionally, and it was a BIG jump
> backwards.  I tracked it down yesterday to a problem with doing 32-bit
> arithmetic in Linux on the tsc values.  For some reason, every 5-20
> minutes xen seems to pause for about 5 seconds.  This causes the tsc to
> wrap if only 32-bits are used, and the 'time went backwards' message is

What happens when there is activity on the system? Do you
still see the pause? 5 seconds is an inordinately long time,
and will impact networking if it happens during normal
workloads too..

thanks,
Nivedita

  parent reply	other threads:[~2005-05-26 18:03 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-05-24  1:20 [PATCH] per-cpu timer changes Ian Pratt
2005-05-26 17:34 ` Don Fry
2005-05-26 18:01   ` Keir Fraser
2005-05-26 18:06     ` Andrew Thompson
2005-05-26 18:03   ` Nivedita Singhvi [this message]
2005-05-26 19:25     ` Don Fry
  -- strict thread matches above, loose matches on Subject: below --
2005-06-07 21:16 Don Fry
2005-05-24  0:35 Don Fry

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