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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>
This commit is contained in:
Waiman Long 2020-05-06 12:22:17 -04:00 committed by Jonathan Corbet
parent 77691ee92d
commit b17b24fc3c
1 changed files with 5 additions and 5 deletions
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10
Documentation/admin-guide/ras.rst
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@ -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,