Gentoo Archives: gentoo-dev

From: Riyad Kalla <rsk@×××××××××.edu>
To: gentoo-user@g.o, gentoo-dev@g.o
Subject: RE: [gentoo-dev] -pentium4 vs -pentium3
Date: Sun, 02 Mar 2003 16:10:06
Message-Id: 001001c2e0d4$834bb2a0$0200000a@rsk
In Reply to: Re: [gentoo-dev] -pentium4 vs -pentium3 by Dhruba Bandopadhyay
1 I second these two questions...
2
3 -----Original Message-----
4 From: Dhruba Bandopadhyay [mailto:dhruba@××××××××××××.uk]
5 Sent: Sunday, March 02, 2003 7:37 AM
6 To: gentoo-dev@g.o
7 Subject: Re: [gentoo-dev] -pentium4 vs -pentium3
8
9
10 Jeff Kowing said:
11 > Robert, I was bit by at least one of the problems a while back. It
12 > seems that some of the floating point code is not quite right yet for
13 > pentium4. I believe this is a gcc and maybe glibc issue. The
14 > particular example that caused me problems is the glibc modf()
15 > function. See
16 > http://forums.gentoo.org/viewtopic.php?t=27211&highlight=python+float
17 > for more info and a sample c program that will highlight the problem.
18 >
19 > It was suggested at the time by Nick Jones (see
20 > http://article.gmane.org/gmane.linux.gentoo.user/23056) that I back
21 > down to pentium2. I haven't updated my portage recently, so I
22 > haven't looked at what the new updated make.conf file suggests but I
23 > definitely would follow any advice it gives.
24
25 I'm also using P4 and have not faced any problems. Would changing to P3
26 result in any noticeable drop in performance? Also, has gcc 3.2.2
27 compensated for this problem at all in comparison to previous releases?
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