bin/85204: [PATCH] add read-ahead to amd for NFS mounts

[Andre Albsmeier]

>Number:         85204
>Category:       bin
>Synopsis:       [PATCH] add read-ahead to amd for NFS mounts
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Mon Aug 22 07:50:19 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Andre Albsmeier
>Release:        FreeBSD 5.4-STABLE i386
>Organization:
>Environment:

FreeBSD 5.4-STABLE #0: Tue Aug 16 16:46:45 CEST 2005

>Description:

amd currently doesn't support the read-ahead feature for NFS
mounts. Since this feature greatly improves performance it
might be a good idea to include it.

>How-To-Repeat:

Try something like 

opts:=...,readahead=5,...

in amd.map

>Fix:

--- contrib/amd/libamu/mount_fs.c.ORI	Tue Mar 22 07:28:23 2005
+++ contrib/amd/libamu/mount_fs.c	Tue Apr 26 13:31:12 2005
@@ -583,6 +583,12 @@
   nap->flags |= MNT2_NFS_OPT_FSNAME;
 #endif /* MNT2_NFS_OPT_FSNAME */
 
+  nap->readahead = hasmntval(mntp, "readahead");
+#ifdef MNT2_NFS_OPT_READAHEAD
+  if (nap->readahead)
+    nap->flags |= MNT2_NFS_OPT_READAHEAD;
+#endif /* MNT2_NFS_OPT_READAHEAD */
+
   nap->rsize = hasmntval(mntp, MNTTAB_OPT_RSIZE);
 #ifdef MNT2_NFS_OPT_RSIZE
   if (nap->rsize)
>Release-Note:
>Audit-Trail:
>Unformatted: