Attachment 299070 Details for Bug 396081 – Tested 4.6 zstream patch that fixes this problem.

[patch] Tested 4.6 zstream patch that fixes this problem.

4.6.z-linux-2.6.9-nfs-read-performance.patch (text/plain), 2.31 KB, created by Larry Woodman on 2008-03-25 20:58:35 UTC

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Creator: Larry Woodman

Created: 2008-03-25 20:58:35 UTC

Size: 2.31 KB

patch

obsolete

>--- linux-2.6.9/kernel/sysctl.c.orig	2008-03-20 12:03:58.000000000 -0400
>+++ linux-2.6.9/kernel/sysctl.c	2008-03-20 12:04:23.000000000 -0400
>@@ -82,6 +82,11 @@ extern int proc_unknown_nmi_panic(ctl_ta
> 
> extern unsigned int vdso_enabled;
> 
>+#ifdef CONFIG_HIGHMEM
>+extern int nfs_writeback_lowmem_only;
>+#endif
>+
>+
> int exec_shield = 1;
> int exec_shield_randomize = 1;
> 
>@@ -993,6 +998,18 @@ static ctl_table vm_table[] = {
> 		.strategy	= &sysctl_intvec,
> 		.extra1		= &zero,
> 	},
>+#ifdef CONFIG_HIGHMEM
>+	{
>+		.ctl_name	= VM_NFS_WB_LOWMEM,
>+		.procname	= "nfs-writeback-lowmem-only",
>+		.data		= &nfs_writeback_lowmem_only,
>+		.maxlen		= sizeof(&nfs_writeback_lowmem_only),
>+		.mode		= 0644,
>+		.proc_handler	= &proc_dointvec,
>+		.strategy	= &sysctl_intvec,
>+		.extra1		= &zero,
>+	},
>+#endif
> 	{ .ctl_name = 0 }
> };
> 
>--- linux-2.6.9/fs/nfs/inode.c.orig	2008-03-20 12:03:51.000000000 -0400
>+++ linux-2.6.9/fs/nfs/inode.c	2008-03-20 12:04:23.000000000 -0400
>@@ -42,6 +42,10 @@
> #include "delegation.h"
> #include "iostat.h"
> 
>+#ifdef CONFIG_HIGHMEM
>+extern int nfs_writeback_lowmem_only;
>+#endif
>+
> #define NFSDBG_FACILITY		NFSDBG_VFS
> #define NFS_PARANOIA 1
> 
>@@ -841,7 +845,8 @@ nfs_fhget(struct super_block *sb, struct
> 			 * writing large files results in OOM when the
> 			 * lowmem is scarce.
> 			 */
>-			mapping_set_gfp_mask(&inode->i_data, GFP_KERNEL);
>+			if (nfs_writeback_lowmem_only)
>+				mapping_set_gfp_mask(&inode->i_data, GFP_KERNEL);
> #endif
> 		} else if (S_ISDIR(inode->i_mode)) {
> 			inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
>--- linux-2.6.9/mm/page-writeback.c.orig	2008-03-20 12:03:58.000000000 -0400
>+++ linux-2.6.9/mm/page-writeback.c	2008-03-20 12:04:23.000000000 -0400
>@@ -98,6 +98,10 @@ int laptop_mode;
> 
> EXPORT_SYMBOL(laptop_mode);
> 
>+int nfs_writeback_lowmem_only = 0;
>+
>+EXPORT_SYMBOL(nfs_writeback_lowmem_only);
>+
> /* End of sysctl-exported parameters */
> 
> atomic_t nr_mapped_high = ATOMIC_INIT(0);
>--- linux-2.6.9/include/linux/sysctl.h.orig	2008-03-20 12:03:58.000000000 -0400
>+++ linux-2.6.9/include/linux/sysctl.h	2008-03-20 12:04:23.000000000 -0400
>@@ -181,6 +181,7 @@ enum
> 	VM_INACTIVE_PERCENT=33, /* desired size of inactive list */
> 	VM_DROP_PAGECACHE=34,   /* nuke lots of pagecache */
> 	VM_WRITE_MAPPED=35,	/* consider mapped pages un dirty_ratio */
>+	VM_NFS_WB_LOWMEM=36,    /* limit NFS writes to Lowmem */
> };
> 
>

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