From: Stephen Hemminger <shemminger@vyatta.com>
To: davem@davemloft.net
Cc: netdev@vger.kernel.org
Subject: [PATCH 4/6] sky2: reduce default Tx ring size
Date: Wed, 16 Nov 2011 15:42:58 -0800 [thread overview]
Message-ID: <20111116234344.813201788@vyatta.com> (raw)
In-Reply-To: 20111116234254.319625694@vyatta.com
[-- Attachment #1: sky2-tx-debloat.patch --]
[-- Type: text/plain, Size: 814 bytes --]
The default Tx ring size for the sky2 driver is quite large and could
cause excess buffer bloat for many users. The minimum ring size
possible and still allow handling the worst case packet on 64bit platforms
is 38 which gets rounded up to a power of 2. But most packets only require
a couple of ring elements.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
--- a/drivers/net/ethernet/marvell/sky2.c 2011-11-16 15:19:39.518659262 -0800
+++ b/drivers/net/ethernet/marvell/sky2.c 2011-11-16 15:19:40.990692544 -0800
@@ -68,7 +68,7 @@
#define MAX_SKB_TX_LE (2 + (sizeof(dma_addr_t)/sizeof(u32))*(MAX_SKB_FRAGS+1))
#define TX_MIN_PENDING (MAX_SKB_TX_LE+1)
#define TX_MAX_PENDING 1024
-#define TX_DEF_PENDING 127
+#define TX_DEF_PENDING 63
#define TX_WATCHDOG (5 * HZ)
#define NAPI_WEIGHT 64
next prev parent reply other threads:[~2011-11-16 23:52 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-16 23:42 [PATCH 0/6] sky2 patches for net-next Stephen Hemminger
2011-11-16 23:42 ` [PATCH 1/6] sky2: fix hang on shutdown (and other irq issues) Stephen Hemminger
2011-11-17 8:46 ` Sven Joachim
2011-11-17 17:01 ` Stephen Hemminger
2011-11-17 18:37 ` Sven Joachim
2011-11-17 19:18 ` Stephen Hemminger
2011-11-17 20:57 ` Sven Joachim
2011-11-18 0:37 ` [PATCH net-next] sky2: fix hang in napi_disable Stephen Hemminger
2011-11-18 1:52 ` David Miller
2011-11-18 2:10 ` Stephen Hemminger
2011-11-18 2:15 ` David Miller
2011-11-18 2:44 ` David Miller
2011-11-16 23:42 ` [PATCH 2/6] sky2: pci posting issues Stephen Hemminger
2011-11-16 23:42 ` [PATCH 3/6] sky2: rename up/down functions Stephen Hemminger
2011-11-16 23:42 ` Stephen Hemminger [this message]
2011-11-17 21:07 ` [PATCH 4/6] sky2: reduce default Tx ring size Sven Joachim
2011-11-17 22:41 ` Stephen Hemminger
2011-11-18 0:37 ` [PATCH net-next] sky2: enforce minimum " Stephen Hemminger
2011-11-18 2:44 ` David Miller
2011-11-16 23:42 ` [PATCH 5/6] sky2: used fixed RSS key Stephen Hemminger
2011-11-16 23:43 ` [PATCH 6/6] sky2: version 1.30 Stephen Hemminger
2011-11-17 1:36 ` [PATCH 0/6] sky2 patches for net-next David Miller
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