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Red Hat Bugzilla – Attachment 156509 Details for
Bug 239998
[RHEL4U5] Performance of Sequential-Read is bad on cciss disk
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[patch]
Sets READ_AHEAD back to 1024
p0001_cciss_read_ahead_1024_for_rhel4u5.patch (text/plain), 971 bytes, created by
Mike Miller (OS Dev)
on 2007-06-07 20:56:21 UTC
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Description:
Sets READ_AHEAD back to 1024
Filename:
MIME Type:
Creator:
Mike Miller (OS Dev)
Created:
2007-06-07 20:56:21 UTC
Size:
971 bytes
patch
obsolete
>This patch bumps read ahead back to 1024. Customers are complaining about >sequential read performance with read ahead = 0. > >Please consider this for inclusion. > >Signed-off-by: Mike Miller <mike.miller@hp.com> >-------------------------------------------------------------------------------- >diff -burNp linux-2.6.9-55.EL.orig/drivers/block/cciss.c linux-2.6.9-55.EL/drivers/block/cciss.c >--- linux-2.6.9-55.EL.orig/drivers/block/cciss.c 2007-05-24 07:59:26.000000000 -0500 >+++ linux-2.6.9-55.EL/drivers/block/cciss.c 2007-06-07 15:50:42.000000000 -0500 >@@ -139,7 +139,7 @@ static struct board_type products[] = { > /*define how many times we will try a command because of bus resets */ > #define MAX_CMD_RETRIES 3 > >-#define READ_AHEAD 0 /* controller handles the read-ahead */ >+#define READ_AHEAD 1024 /* controller handles the read-ahead */ > #define MAX_CTLR 32 /* max number of supported controllers */ > #define NR_CMDS 384 /* # commands that can be outstanding */ >
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