Date: Sun, 16 May 1999 12:52:09 -0700 (PDT) From: sobomax@altavista.net To: freebsd-gnats-submit@freebsd.org Subject: kern/11736: On fast machines kernel reports negative i586_bzero bandwith values due to datatype overflow Message-ID: <19990516195209.1464B1512C@hub.freebsd.org>
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>Number: 11736
>Category: kern
>Synopsis: On fast machines kernel reports negative i586_bzero bandwith values due to datatype overflow
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Sun May 16 13:00:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator: Maxim Sobolev
>Release: 4.0-CURRENT
>Organization:
Vega International Capital
>Environment:
>Description:
On the fast machine with lot of cache (K6-2 250MHz, 1024KBcache respectevly
in my case) i586_bzero bandwith in bytes may exceed 2^31 (signed long
datatype maximum value - i.e > 2.147.483.648 bytes/s) and kernel in
verbose mode will report negative bandwith.
>How-To-Repeat:
1. Take a relatively fast machine
2. Boot with -v option
3. Look at the dmesg output ;)
>Fix:
--- npx.c.orig Sat May 15 01:14:13 1999
+++ npx.c Sat May 15 02:01:51 1999
@@ -696,8 +696,8 @@
if (usec <= 0)
usec = 1;
if (bootverbose)
- printf("%s bandwidth = %ld bytes/sec\n",
- funcname, (long)(BUFSIZE * (int64_t)1000000 / usec));
+ printf("%s bandwidth = %ld Kbytes/sec\n",
+ funcname, (long)(BUFSIZE * (int64_t)1000000 / (1024*usec)));
free(buf, M_TEMP);
return (usec);
}
>Release-Note:
>Audit-Trail:
>Unformatted:
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