docs/50720: [PATCH] doc/en_US.ISO8859-1/books/faq/book.sgml: add QAs (scheduler)

[Sergey A.Osokin]

>Number:         50720
>Category:       docs
>Synopsis:       [PATCH] doc/en_US.ISO8859-1/books/faq/book.sgml: add QAs (scheduler)
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-doc
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          update
>Submitter-Id:   current-users
>Arrival-Date:   Tue Apr 08 05:30:08 PDT 2003
>Closed-Date:
>Last-Modified:
>Originator:     Sergey A. Osokin
>Release:        FreeBSD 5.0-CURRENT i386
>Organization:
n/a
>Environment:
System: FreeBSD 5.0-CURRENT i386

>Description:
	doc/en_US.ISO8859-1/books/faq/book.sgml: add QAs (scheduler)
	Obtained from -current@ (des@ answers)
>How-To-Repeat:
	
>Fix:

Index: doc/en_US.ISO8859-1/books/faq/book.sgml
===================================================================
RCS file: /home/ncvs/doc/en_US.ISO8859-1/books/faq/book.sgml,v
retrieving revision 1.526
diff -u -r1.526 book.sgml
--- doc/en_US.ISO8859-1/books/faq/book.sgml	7 Apr 2003 18:37:59 -0000	1.526
+++ doc/en_US.ISO8859-1/books/faq/book.sgml	8 Apr 2003 11:58:22 -0000
@@ -5355,6 +5355,37 @@
           </itemizedlist>
         </answer>
       </qandaentry>
+
+      <qandaentry>
+        <question id="scheduler-in-use">
+          <para>How can I verify which scheduler is in use on a running system?</para>
+        </question>
+
+        <answer>
+          <para>Just type:
+            <screen>&prompt.root; <userinput>sysctl kern.quantum</userinput></screen>
+            If you see
+            <screen>unknown oid 'kern.quantum'</screen>
+            it means that you use new <quote>SCHED_ULE</quote> scheduler, but
+            if you see
+            <screen>kern.quantum: 100000</screen>
+	     that means your system runs under old <quote>SCHED_4BSD</quote> scheduler.
+          </para>
+        </answer>
+      </qandaentry>
+
+      <qandaentry>
+        <question id="scheduler-kern-quantum">
+          <para>What does it mean 'kern.quantum'?</para>
+        </question>
+
+        <answer>
+          <para>It is the maximum number of ticks a process can run without being
+            preempted.  It is specific to the 4BSD scheduler, so you can use it
+            presence or absence to determine which scheduler is in use.
+          </para>
+        </answer>
+      </qandaentry>
     </qandaset>
   </chapter>
 
>Release-Note:
>Audit-Trail:
>Unformatted: