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Date: Mon, 27 Aug 2012 12:01:41 -0400 From: Namjae Jeon <linkinjeon@...il.com> To: fengguang.wu@...el.com, akpm@...ux-foundation.org Cc: linux-kernel@...r.kernel.org, Namjae Jeon <linkinjeon@...il.com>, Namjae Jeon <namjae.jeon@...sung.com>, Vivek Trivedi <t.vivek@...sung.com> Subject: [PATCH 2/2] Documentation: add description of dirty_background_time From: Namjae Jeon <namjae.jeon@...sung.com> This commit adds dirty_background_time description in bdi sysfs documentation. Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com> Signed-off-by: Vivek Trivedi <t.vivek@...sung.com> --- Documentation/ABI/testing/sysfs-class-bdi | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi index 5f50097..018e26a 100644 --- a/Documentation/ABI/testing/sysfs-class-bdi +++ b/Documentation/ABI/testing/sysfs-class-bdi @@ -48,3 +48,16 @@ max_ratio (read-write) most of the write-back cache. For example in case of an NFS mount that is prone to get stuck, or a FUSE mount which cannot be trusted to play fair. + +dirty_background_time (read-write) + + It is used to start early writeback of given bdi once bdi dirty + data exceeds product of average write bandwidth and + dirty_background_time. It is mainly useful for tuning writeback + speed at 'NFS Server' so that NFS client could see better write speed. + + However, sometimes it may not match user expectations as it is based + on bdi write bandwidth estimation. Write bandwidth estimation is a + best effort to estimate bdi write speed bandwidth. But it can be + wildly wrong in certain situations. + dirty_background_time is expressed in msec. -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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