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Re: Benchmark performance

To: wgowcher@yahoo.com
Subject: Re: Benchmark performance
From: Atsushi Nemoto <nemoto@toshiba-tops.co.jp>
Date: Thu, 16 Aug 2001 12:56:52 +0900
Cc: linux-mips@oss.sgi.com
In-reply-to: <20010813173446.61234.qmail@web11901.mail.yahoo.com>
Organization: TOSHIBA Personal Computer System Corporation
References: <20010809215522.A1958@lucon.org> <20010813173446.61234.qmail@web11901.mail.yahoo.com>
Sender: owner-linux-mips@oss.sgi.com
>>>>> On Mon, 13 Aug 2001 10:34:46 -0700 (PDT), Wayne Gowcher 
>>>>> <wgowcher@yahoo.com> said:
wgowcher> a 23 % reduction in the Floating Point Index benchmark

Current CVS kernel uses FPU emulator unconditionally.  If one floating
point intruction causes a 'Unimplemented' exception (denormalized
result, etc.) following floating point instructions are also handle by
FPU emulator (not only the instruction which raise the exception).

I do not know this is really desired behavior, but here is a patch to
change this.  If Unimplemented exception had been occured during the
benchmark, aplying this patch may result better performance.

---
Atsushi Nemoto

Attachment: fpu_emu.patch
Description: Text document

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