From owner-freebsd-ports  Wed Sep 22  3: 0: 4 1999
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Date: Wed, 22 Sep 1999 02:51:28 -0700 (PDT)
From: sobomax@altavista.net
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Subject: ports/13894: [PATCH] Very low Samba write speed
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>Number:         13894
>Category:       ports
>Synopsis:       [PATCH] Very low Samba write speed
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-ports
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Sep 22 03:00:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Maxim Sobolev
>Release:        3.3-STABLE
>Organization:
Vega International Capital
>Environment:
FreeBSD vega 3.3-STABLE FreeBSD 3.3-STABLE #0: Fri Sep 17 20:11:17 EEST 1999  max@vega:/usr/src/sys/compile/VEGA  i386

>Description:
Following is description made by one of the Samba developers:

"The problem is we switched to using recv() with the MSG_WAITALL flag instead of read(). This makes Samba faster on most systems. On FreeBSD it causes a massive slowdown and I don't know why. To fix it, change the definition of MSG_WAITALL to be zero in lib/util_sock.c and recompile 2.0.5a. I'm hoping someone from FreeBSD will get back to me with some explanation. Regards, Jeremy Allison, Samba Team."

This problem where observed by almost all samba-2.0.5a users and typically it led to 10-20x decrease in write speed.

>How-To-Repeat:

>Fix:
--- lib/util_sock.c.orig	Wed Sep 22 10:52:50 1999
+++ lib/util_sock.c	Wed Sep 22 11:30:18 1999
@@ -28,6 +28,9 @@
 extern int  sslFd;
 #endif  /* WITH_SSL */
 
+#undef MSG_WAITALL
+#define MSG_WAITALL 0
+
 extern int DEBUGLEVEL;
 
 BOOL passive = False;


>Release-Note:
>Audit-Trail:
>Unformatted:


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