An update from Feng: Subject: nfs: fix a bug about adjusting nfs_congestion_kb Date: Tue Oct 18 12:47:58 CST 2011 From: "Tang, Feng" <feng.tang@xxxxxxxxx> The VM dirty_thresh may be set to very small(even 0) by wired user, in such case, nfs_congestion_kb may be adjusted to 0, will cause the normal NFS write function get congested and deaklocked. So let's set the bottom line of nfs_congestion_kb to 128kb. Signed-off-by: Feng Tang <feng.tang@xxxxxxxxx> Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx> --- fs/nfs/write.c | 1 + 1 file changed, 1 insertion(+) --- linux-next.orig/fs/nfs/write.c 2011-10-17 16:07:40.000000000 +0800 +++ linux-next/fs/nfs/write.c 2011-10-18 12:47:46.000000000 +0800 @@ -1814,6 +1814,7 @@ void nfs_update_congestion_thresh(void) */ global_dirty_limits(&background_thresh, &dirty_thresh); dirty_thresh <<= PAGE_SHIFT - 10; + dirty_thresh += 1024; if (nfs_congestion_kb > dirty_thresh / 8) nfs_congestion_kb = dirty_thresh / 8; -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>