RE: [RFC] 4-level page table directories.

From: Chen, Kenneth W <>
Date: 2005-11-04 06:59:00
Robin Holt wrote on Thursday, November 03, 2005 8:37 AM
> On Wed, Nov 02, 2005 at 05:53:10PM -0800, Chen, Kenneth W wrote:
> > I just did a quick measurement with I/O submission path.  get_user_pages
> > is my biggest concern that extra level means more code and cache foot
> > print for each I/O submission.  It cost about 1.5% more in I/O path
> > length on a micro-benchmark (from block layer and Up).  This could be
> > all buried as noise in a larger scheme for industry database benchmark.
> Can you point me at the benchmark?

Here, kernel null blk driver:

And here: user space micro-benchmark:

- Ken

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Received on Fri Nov 04 06:59:38 2005

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