From: Anton Blanchard <anton@samba•org>
To: brking@linux•vnet.ibm.com, santil@linux•vnet.ibm.com
Cc: netdev@vger•kernel.org
Subject: [patch 02/20] ibmveth: batch rx buffer replacement
Date: Mon, 23 Aug 2010 10:09:32 +1000 [thread overview]
Message-ID: <20100823001238.474940661@samba.org> (raw)
In-Reply-To: 20100823000930.546065833@samba.org
[-- Attachment #1: veth_watermark --]
[-- Type: text/plain, Size: 2158 bytes --]
At the moment we try and replenish the receive ring on every rx interrupt.
We even have a pool->threshold but aren't using it.
To limit the maximum latency incurred when refilling, change the threshold
from 1/2 to 7/8 and reduce the largest rx pool from 768 buffers to 512 which
should be more than enough.
Signed-off-by: Anton Blanchard <anton@samba•org>
---
Index: net-next-2.6/drivers/net/ibmveth.c
===================================================================
--- net-next-2.6.orig/drivers/net/ibmveth.c 2010-08-23 08:52:26.774004158 +1000
+++ net-next-2.6/drivers/net/ibmveth.c 2010-08-23 08:52:27.963919704 +1000
@@ -178,7 +178,7 @@ static void ibmveth_init_buffer_pool(str
pool->size = pool_size;
pool->index = pool_index;
pool->buff_size = buff_size;
- pool->threshold = pool_size / 2;
+ pool->threshold = pool_size * 7 / 8;
pool->active = pool_active;
}
@@ -315,10 +315,13 @@ static void ibmveth_replenish_task(struc
adapter->replenish_task_cycles++;
- for (i = (IbmVethNumBufferPools - 1); i >= 0; i--)
- if(adapter->rx_buff_pool[i].active)
- ibmveth_replenish_buffer_pool(adapter,
- &adapter->rx_buff_pool[i]);
+ for (i = (IbmVethNumBufferPools - 1); i >= 0; i--) {
+ struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
+
+ if (pool->active &&
+ (atomic_read(&pool->available) < pool->threshold))
+ ibmveth_replenish_buffer_pool(adapter, pool);
+ }
adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
}
Index: net-next-2.6/drivers/net/ibmveth.h
===================================================================
--- net-next-2.6.orig/drivers/net/ibmveth.h 2010-08-23 08:52:16.164757227 +1000
+++ net-next-2.6/drivers/net/ibmveth.h 2010-08-23 08:52:27.963919704 +1000
@@ -102,7 +102,7 @@ static inline long h_illan_attributes(un
#define IBMVETH_MAX_BUF_SIZE (1024 * 128)
static int pool_size[] = { 512, 1024 * 2, 1024 * 16, 1024 * 32, 1024 * 64 };
-static int pool_count[] = { 256, 768, 256, 256, 256 };
+static int pool_count[] = { 256, 512, 256, 256, 256 };
static int pool_active[] = { 1, 1, 0, 0, 0};
#define IBM_VETH_INVALID_MAP ((u16)0xffff)
next prev parent reply other threads:[~2010-08-23 0:27 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-23 0:09 [patch 00/20] ibmveth update Anton Blanchard
2010-08-23 0:09 ` [patch 01/20] ibmveth: Remove integer divide caused by modulus Anton Blanchard
2010-08-23 0:09 ` Anton Blanchard [this message]
2010-08-23 0:09 ` [patch 03/20] ibmveth: Remove LLTX Anton Blanchard
2010-08-23 0:09 ` [patch 04/20] ibmveth: Add tx_copybreak Anton Blanchard
2010-08-23 0:09 ` [patch 05/20] ibmveth: Add rx_copybreak Anton Blanchard
2010-08-23 0:09 ` [patch 06/20] ibmveth: Use lighter weight read memory barrier in ibmveth_poll Anton Blanchard
2010-08-23 0:09 ` [patch 07/20] ibmveth: Add scatter-gather support Anton Blanchard
2010-08-23 0:09 ` [patch 08/20] ibmveth: Dont overallocate buffers Anton Blanchard
2010-08-23 20:49 ` Robert Jennings
2010-08-25 13:44 ` Brian King
2010-08-23 0:09 ` [patch 09/20] ibmveth: Add optional flush of rx buffer Anton Blanchard
2010-08-23 0:09 ` [patch 10/20] ibmveth: remove procfs code Anton Blanchard
2010-08-23 0:09 ` [patch 11/20] ibmveth: Convert to netdev_alloc_skb Anton Blanchard
2010-08-23 0:09 ` [patch 12/20] ibmveth: Remove redundant function prototypes Anton Blanchard
2010-08-23 0:09 ` [patch 13/20] ibmveth: Convert driver specific debug to netdev_dbg Anton Blanchard
2010-08-23 0:09 ` [patch 14/20] ibmveth: Convert driver specific error functions to netdev_err Anton Blanchard
2010-08-23 0:09 ` [patch 15/20] ibmveth: Some formatting fixes Anton Blanchard
2010-08-23 0:09 ` [patch 16/20] ibmveth: Coding style fixes Anton Blanchard
2010-08-23 0:09 ` [patch 17/20] ibmveth: Return -EINVAL on all ->probe errors Anton Blanchard
2010-08-23 0:09 ` [patch 18/20] ibmveth: Convert driver specific assert to BUG_ON Anton Blanchard
2010-08-23 0:09 ` [patch 19/20] ibmveth: Remove some unnecessary include files Anton Blanchard
2010-08-23 0:09 ` [patch 20/20] ibmveth: Update module information and version Anton Blanchard
2010-08-23 1:57 ` [patch 00/20] ibmveth update David Miller
2010-08-23 2:07 ` Anton Blanchard
2010-08-23 2:15 ` David Miller
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