diff --git a/lustre/ChangeLog b/lustre/ChangeLog
index 2391bc7ad31f13441735ec0f6c656e51ec0527d6..3c194279982bc19ac82aefd3f47efbb3e7e1fe65 100644
--- a/lustre/ChangeLog
+++ b/lustre/ChangeLog
@@ -2,7 +2,7 @@ tbd Cluster File Systems, Inc. <info@clusterfs.com>
* version 1.6.4
* Support for kernels:
2.6.5-7.286 (SLES 9),
- 2.6.9-55.0.2.EL (RHEL 4),
+ 2.6.9-55.0.6.EL (RHEL 4),
2.6.16.46-0.14 (SLES 10),
2.6.18-8.1.10.el5 (RHEL 5),
2.6.18.8 vanilla (kernel.org)
@@ -88,6 +88,10 @@ Details : If LAST_ID value on disk is smaller than the objects existing in
LBUG(). If the object is 0-length, then we should use the existing
object. This will help to avoid a full fsck in most cases.
+Severity : normal
+Bugzilla : 13518
+Description: Kernel patches update for RHEL4 2.6.9-55.0.6.
+Details : Modify vm-tunables-rhel4.patch.
--------------------------------------------------------------------------------
diff --git a/lustre/kernel_patches/patches/vm-tunables-rhel4.patch b/lustre/kernel_patches/patches/vm-tunables-rhel4.patch
index 7e4a9d615e30ab8ece44e3d889bc392a13784c38..db2460b21721b3ac0338c1f0350e67677b8ea036 100644
--- a/lustre/kernel_patches/patches/vm-tunables-rhel4.patch
+++ b/lustre/kernel_patches/patches/vm-tunables-rhel4.patch
@@ -17,57 +17,3 @@ Index: linux+rhel4+chaos/mm/page_alloc.c
spin_unlock_irqrestore(&zone->lru_lock, flags);
}
}
-@@ -1982,24 +1986,25 @@ static void setup_per_zone_pages_min(voi
- * Initialise min_free_kbytes.
- *
- * For small machines we want it small (128k min). For large machines
-- * we want it large (16MB max). But it is not linear, because network
-+ * we want it large (64MB max). But it is not linear, because network
- * bandwidth does not increase linearly with machine size. We use
- *
-- * min_free_kbytes = sqrt(lowmem_kbytes)
-+ * min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy
-+ * min_free_kbytes = sqrt(lowmem_kbytes * 16)
- *
- * which yields
- *
-- * 16MB: 128k
-- * 32MB: 181k
-- * 64MB: 256k
-- * 128MB: 362k
-- * 256MB: 512k
-- * 512MB: 724k
-- * 1024MB: 1024k
-- * 2048MB: 1448k
-- * 4096MB: 2048k
-- * 8192MB: 2896k
-- * 16384MB: 4096k
-+ * 16MB: 512k
-+ * 32MB: 724k
-+ * 64MB: 1024k
-+ * 128MB: 1448k
-+ * 256MB: 2048k
-+ * 512MB: 2896k
-+ * 1024MB: 4096k
-+ * 2048MB: 5792k
-+ * 4096MB: 8192k
-+ * 8192MB: 11584k
-+ * 16384MB: 16384k
- */
- static int __init init_per_zone_pages_min(void)
- {
-@@ -2007,11 +2012,11 @@ static int __init init_per_zone_pages_mi
-
- lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10);
-
-- min_free_kbytes = int_sqrt(lowmem_kbytes);
-+ min_free_kbytes = int_sqrt(lowmem_kbytes * 16);
- if (min_free_kbytes < 128)
- min_free_kbytes = 128;
-- if (min_free_kbytes > 16384)
-- min_free_kbytes = 16384;
-+ if (min_free_kbytes > 65536)
-+ min_free_kbytes = 65536;
- setup_per_zone_pages_min();
- setup_per_zone_protection();
- return 0;
diff --git a/lustre/kernel_patches/targets/2.6-rhel4.target.in b/lustre/kernel_patches/targets/2.6-rhel4.target.in
index 68128a0d7cd40d4a4b89458f9b2e6c256da2aaa3..43e00218896462f36457bc370fd6f9cf012842fa 100644
--- a/lustre/kernel_patches/targets/2.6-rhel4.target.in
+++ b/lustre/kernel_patches/targets/2.6-rhel4.target.in
@@ -1,5 +1,5 @@
lnxmaj="2.6.9"
-lnxrel="55.0.2.EL"
+lnxrel="55.0.6.EL"
KERNEL=linux-${lnxmaj}-${lnxrel}.tar.bz2
SERIES=2.6-rhel4.series
diff --git a/lustre/kernel_patches/which_patch b/lustre/kernel_patches/which_patch
index 3705195cdbbc0b07c1a7fd75724e553404d3497d..edbe77d0643167480d1e10ac95440416703afae7 100644
--- a/lustre/kernel_patches/which_patch
+++ b/lustre/kernel_patches/which_patch
@@ -3,7 +3,7 @@ SERIES VERSION COMMENT
SUPPORTED KERNELS:
2.6-suse SLES9 before SP1 already in SLES9 SP1 kernel
2.6-suse-newer SLES9: 2.6.5-7.286 extra patches for SLES9 after SP1
-2.6-rhel4 RHEL4: 2.6.9-55.0.2.EL
+2.6-rhel4 RHEL4: 2.6.9-55.0.6.EL
2.6-sles10 SLES10: 2.6.16.46-0.14
2.6-rhel5.series RHEL5: 2.6.18-8.1.10.el5
2.6.18-vanilla.series kernel.org: 2.6.18.8