[ovs-dev] [PATCH] datapath: An expanded table should be larger than its predecessor

[Simon Horman]

This resolves what appears to be a think-o in tbl_expand()

* Old Logic: Always create tables with TBL_MIN_BUCKETS buckets
* New Logic: Create tables twice as big as their predecessor

When sending 10,000 flows through ovs-vswitchd:
* Old Logic: CPU bound in tbl_lookup(), significant packet loss
* New Logic: ~10% of one core used, negligible packet loss

Tested with an Intel E5520 @ 2.27GHz,
flows from an ethernet device to to a dummy interface with
no address configured.

Signed-off-by: Simon Horman <horms at verge.net.au>
---
 datapath/table.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/datapath/table.c b/datapath/table.c
index 725845d..76086ee 100644
--- a/datapath/table.c
+++ b/datapath/table.c
@@ -339,7 +339,7 @@ struct tbl *tbl_expand(struct tbl *table)
 	}
 
 	err = -ENOMEM;
-	new_table = tbl_create(TBL_MIN_BUCKETS);
+	new_table = tbl_create(n_buckets);
 	if (!new_table)
 		goto error;
 
-- 
1.7.5.4