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authorWaiman Long <longman@redhat.com>2020-05-06 12:22:17 -0400
committerJonathan Corbet <corbet@lwn.net>2020-05-15 11:38:00 -0600
commitb17b24fc3c10048502196fff56dcaf13938d1e75 (patch)
tree50043b3659fc3ffa65f5b4ce83822a4813b07c2a /Documentation
parent77691ee92d4abdc926c60b6fa1a5cbbe935e1244 (diff)
downloadlwn-b17b24fc3c10048502196fff56dcaf13938d1e75.tar.gz
lwn-b17b24fc3c10048502196fff56dcaf13938d1e75.zip
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 <longman@redhat.com> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Link: https://lore.kernel.org/r/20200506162217.16633-1-longman@redhat.com Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/admin-guide/ras.rst10
1 files changed, 5 insertions, 5 deletions
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,