2010-07-07 11:12:45 +00:00
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From: Jan Kara <jack@suse.cz>
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Subject: Update readahead and max_sectors tunables
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References: bnc#548529
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Patch-mainline: no
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Increase read_ahead_kb and max_sectors_kb to values from SLES10 SP3 to get
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back sequential IO performance if we are not compiling a -desktop kernel
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flavor.
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Signed-off-by: Jan Kara <jack@suse.cz>
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---
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include/linux/blkdev.h | 4 ++++
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include/linux/mm.h | 4 ++++
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2 files changed, 8 insertions(+)
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--- a/include/linux/blkdev.h
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+++ b/include/linux/blkdev.h
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2011-04-19 20:09:59 +00:00
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@@ -947,7 +947,11 @@ extern int blk_verify_command(unsigned c
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2010-07-07 11:12:45 +00:00
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enum blk_default_limits {
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BLK_MAX_SEGMENTS = 128,
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BLK_SAFE_MAX_SECTORS = 255,
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+#ifndef CONFIG_KERNEL_DESKTOP
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+ BLK_DEF_MAX_SECTORS = 2048,
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+#else
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BLK_DEF_MAX_SECTORS = 1024,
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+#endif
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BLK_MAX_SEGMENT_SIZE = 65536,
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BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
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};
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--- a/include/linux/mm.h
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+++ b/include/linux/mm.h
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2011-04-19 20:09:59 +00:00
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@@ -1307,7 +1307,11 @@ int write_one_page(struct page *page, in
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2010-07-07 11:12:45 +00:00
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void task_dirty_inc(struct task_struct *tsk);
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/* readahead.c */
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+#ifndef CONFIG_KERNEL_DESKTOP
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+#define VM_MAX_READAHEAD 512 /* kbytes */
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+#else
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#define VM_MAX_READAHEAD 128 /* kbytes */
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+#endif
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#define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
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int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
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