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Re: making use of large TLB pages

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Neil Conway <neilc(at)samurai(dot)com>,PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: making use of large TLB pages
Date: 2002-09-29 21:30:12
Message-ID: 200209292130.g8TLUCH19997@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Tom Lane wrote:
> Neil Conway <neilc(at)samurai(dot)com> writes:
> > Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> >> OK, personally, I would like to see an actual speedup of PostgreSQL
> >> queries before I would apply such a OS-specific, version-specific
> >> patch.
> 
> > Don't be silly. A performance improvement is a performance
> > improvement.
> 
> No, Bruce was saying that he wanted to see demonstrable improvement
> *due to this specific change* before committing to support a
> platform-specific API.  I agree with him, actually.  If you do the
> TLB code and can't measure any meaningful performance improvement
> when using it vs. when not, I'd not be excited about cluttering the
> distribution with it.
> 
> > I think it's at least worth implementing -- if it doesn't provide a
> > noticeable performance improvement, then we don't need to merge it.
> 
> You're on the same page, you just don't realize it...

I see what he thought I said, I just can't figure out how he read it
that way.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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