From b17b24fc3c10048502196fff56dcaf13938d1e75 Mon Sep 17 00:00:00 2001 From: Waiman Long Date: Wed, 6 May 2020 12:22:17 -0400 Subject: doc: Fix some errors in ras.rst Make some miscellaneous fixes to the first paragraph of "ECC memory": - Change the incorrect "74 bits" to "72 bits". - Change "mentioned on" to "mentioned in". - Remove the extra "extra". - Rephrase some sentences as suggested by Matthew Wilcox. Signed-off-by: Waiman Long Reviewed-by: Matthew Wilcox (Oracle) Link: https://lore.kernel.org/r/20200506162217.16633-1-longman@redhat.com Signed-off-by: Jonathan Corbet --- Documentation/admin-guide/ras.rst | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'Documentation/admin-guide/ras.rst') diff --git a/Documentation/admin-guide/ras.rst b/Documentation/admin-guide/ras.rst index 6cbaab975ee5..7b481b2a368e 100644 --- a/Documentation/admin-guide/ras.rst +++ b/Documentation/admin-guide/ras.rst @@ -156,11 +156,11 @@ the labels provided by the BIOS won't match the real ones. ECC memory ---------- -As mentioned on the previous section, ECC memory has extra bits to be -used for error correction. So, on 64 bit systems, a memory module -has 64 bits of *data width*, and 74 bits of *total width*. So, there are -8 bits extra bits to be used for the error detection and correction -mechanisms. Those extra bits are called *syndrome*\ [#f1]_\ [#f2]_. +As mentioned in the previous section, ECC memory has extra bits to be +used for error correction. In the above example, a memory module has +64 bits of *data width*, and 72 bits of *total width*. The extra 8 +bits which are used for the error detection and correction mechanisms +are referred to as the *syndrome*\ [#f1]_\ [#f2]_. So, when the cpu requests the memory controller to write a word with *data width*, the memory controller calculates the *syndrome* in real time, -- cgit v1.2.3