From: "H. Peter Anvin" <hpa@zytor.com>
To: Timothy Miller <miller@techsource.com>
Cc: Ulrich Drepper <drepper@redhat.com>, linux-kernel@vger.kernel.org
Subject: Re: hammer: MAP_32BIT
Date: Fri, 09 May 2003 15:20:06 -0700 [thread overview]
Message-ID: <3EBC2996.2040908@zytor.com> (raw)
In-Reply-To: <3EBC29A5.1050005@techsource.com>
Timothy Miller wrote:
>
> If your program is capable of handling an address with more than 32
> bits, what point is there giving a hint? Either your program can handle
> 64-bit pointers or it cannot. Any program flexible enough to handle
> either size dynamically would expend enough overhead checking that it
> would be worse than if it just made a hard choice.
>
The purpose is that there is a slight task-switching speed advantage if
the address is in the bottom 4 GB. Since this affects every process,
and most processes use very little TLS, this is worthwhile.
This is fundamentally due to a K8 design flaw.
-hpa
next prev parent reply other threads:[~2003-05-09 22:07 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-09 7:35 hammer: MAP_32BIT Ulrich Drepper
2003-05-09 9:20 ` Andi Kleen
2003-05-09 11:28 ` mikpe
2003-05-09 11:38 ` Andi Kleen
2003-05-09 11:52 ` mikpe
2003-05-09 12:16 ` Andi Kleen
2003-05-09 18:11 ` H. Peter Anvin
2003-05-09 19:24 ` Ulrich Drepper
2003-05-09 20:55 ` H. Peter Anvin
2003-05-09 21:45 ` Ulrich Drepper
2003-05-09 22:07 ` H. Peter Anvin
2003-05-09 22:20 ` Ulrich Drepper
2003-05-09 22:21 ` H. Peter Anvin
2003-05-09 22:20 ` Timothy Miller
2003-05-09 22:20 ` H. Peter Anvin [this message]
2003-05-09 22:46 ` Timothy Miller
2003-05-09 23:24 ` H. Peter Anvin
2003-05-13 14:25 ` Timothy Miller
2003-05-09 22:22 ` Ulrich Drepper
2003-05-09 22:53 ` Timothy Miller
2003-05-09 23:24 ` Ulrich Drepper
2003-05-10 0:00 ` Edgar Toernig
2003-05-10 0:58 ` Ulrich Drepper
2003-05-10 2:51 ` Edgar Toernig
2003-05-09 17:36 ` H. Peter Anvin
2003-05-09 17:39 ` Ulrich Drepper
2003-05-10 1:48 ` Andi Kleen
2003-05-10 20:10 ` David Woodhouse
2003-05-13 18:54 ` H. Peter Anvin
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