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Date: Fri, 03 Sep 2010 23:28:09 -0500 From: Santiago Leon <santil@...ux.vnet.ibm.com> To: netdev@...r.kernel.org Cc: brking@...ux.vnet.ibm.com, Santiago Leon <santil@...ux.vnet.ibm.com>, anton@...ba.org Subject: [patch 02/21] 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 <anton@...ba.org> Signed-off-by: Santiago Leon <santil@...ux.vnet.ibm.com> --- Index: net-next-2.6/drivers/net/ibmveth.c =================================================================== --- net-next-2.6.orig//drivers/net/ibmveth.c 2010-09-03 22:18:36.000000000 -0500 +++ net-next-2.6/drivers/net/ibmveth.c 2010-09-03 22:18:37.000000000 -0500 @@ -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 2010-09-03 22:17:03.000000000 -0500 +++ net-next-2.6/drivers/net/ibmveth.h 2010-09-03 22:18:37.000000000 -0500 @@ -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) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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