From c033a6d1390bb6cc0c11c3b4137b856dfd8cb7c8 Mon Sep 17 00:00:00 2001 From: Santiago Leon Date: Fri, 3 Sep 2010 18:28:09 +0000 Subject: ibmveth: batch rx buffer replacement 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 Signed-off-by: Santiago Leon Signed-off-by: David S. Miller --- drivers/net/ibmveth.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) (limited to 'drivers/net/ibmveth.c') diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c index d2cc6d3f401c..3515ef318eb0 100644 --- a/drivers/net/ibmveth.c +++ b/drivers/net/ibmveth.c @@ -178,7 +178,7 @@ static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, u32 pool_in 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(struct ibmveth_adapter *adapter) 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); } -- cgit v1.2.2