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authorFrank Pavlic <fpavlic@de.ibm.com>2006-02-07 11:04:36 -0500
committerJeff Garzik <jgarzik@pobox.com>2006-02-17 16:16:39 -0500
commit0d613a27cc753bfacd20e6eaa2183bb7fef4c76e (patch)
tree670fc8e8a703874c2c7b8626fb646679389fce1b /drivers/s390/net/lcs.c
parentca5b0ec8ae9f11c85d1f27b19f182a054303f324 (diff)
[PATCH] s390: lcs performance enhancements
[patch 1/2] s390: lcs performance enhancements From: Klaus Wacker <kdwacker@de.ibm.com> - When flood pinging (with large packet size) an LCS device, about 90 % of all packets are dropped by driver. - increased number of lcs IO buffers to 32. - use netif_stop_queue/netif_wake_queue in lcs_start_xmit routine - don't lock the whole xmit routine but just the piece of code where tx_buffer is touched. Signed-off-by: Frank Pavlic <fpavlic@de.ibm.com> diffstat: lcs.c | 31 +++++++++++++++++-------------- lcs.h | 2 +- 2 files changed, 18 insertions(+), 15 deletions(-) Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Diffstat (limited to 'drivers/s390/net/lcs.c')
-rw-r--r--drivers/s390/net/lcs.c31
1 files changed, 17 insertions, 14 deletions
diff --git a/drivers/s390/net/lcs.c b/drivers/s390/net/lcs.c
index 6229ba4995ad..9cf88d7201d3 100644
--- a/drivers/s390/net/lcs.c
+++ b/drivers/s390/net/lcs.c
@@ -98,9 +98,9 @@ lcs_register_debug_facility(void)
98 return -ENOMEM; 98 return -ENOMEM;
99 } 99 }
100 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view); 100 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
101 debug_set_level(lcs_dbf_setup, 4); 101 debug_set_level(lcs_dbf_setup, 2);
102 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view); 102 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
103 debug_set_level(lcs_dbf_trace, 4); 103 debug_set_level(lcs_dbf_trace, 2);
104 return 0; 104 return 0;
105} 105}
106 106
@@ -1292,9 +1292,8 @@ lcs_set_multicast_list(struct net_device *dev)
1292 LCS_DBF_TEXT(4, trace, "setmulti"); 1292 LCS_DBF_TEXT(4, trace, "setmulti");
1293 card = (struct lcs_card *) dev->priv; 1293 card = (struct lcs_card *) dev->priv;
1294 1294
1295 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD)) { 1295 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1296 schedule_work(&card->kernel_thread_starter); 1296 schedule_work(&card->kernel_thread_starter);
1297 }
1298} 1297}
1299 1298
1300#endif /* CONFIG_IP_MULTICAST */ 1299#endif /* CONFIG_IP_MULTICAST */
@@ -1459,6 +1458,8 @@ lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1459 lcs_release_buffer(channel, buffer); 1458 lcs_release_buffer(channel, buffer);
1460 card = (struct lcs_card *) 1459 card = (struct lcs_card *)
1461 ((char *) channel - offsetof(struct lcs_card, write)); 1460 ((char *) channel - offsetof(struct lcs_card, write));
1461 if (netif_queue_stopped(card->dev))
1462 netif_wake_queue(card->dev);
1462 spin_lock(&card->lock); 1463 spin_lock(&card->lock);
1463 card->tx_emitted--; 1464 card->tx_emitted--;
1464 if (card->tx_emitted <= 0 && card->tx_buffer != NULL) 1465 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
@@ -1478,6 +1479,7 @@ __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1478 struct net_device *dev) 1479 struct net_device *dev)
1479{ 1480{
1480 struct lcs_header *header; 1481 struct lcs_header *header;
1482 int rc = 0;
1481 1483
1482 LCS_DBF_TEXT(5, trace, "hardxmit"); 1484 LCS_DBF_TEXT(5, trace, "hardxmit");
1483 if (skb == NULL) { 1485 if (skb == NULL) {
@@ -1492,10 +1494,8 @@ __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1492 card->stats.tx_carrier_errors++; 1494 card->stats.tx_carrier_errors++;
1493 return 0; 1495 return 0;
1494 } 1496 }
1495 if (netif_queue_stopped(dev) ) { 1497 netif_stop_queue(card->dev);
1496 card->stats.tx_dropped++; 1498 spin_lock(&card->lock);
1497 return -EBUSY;
1498 }
1499 if (card->tx_buffer != NULL && 1499 if (card->tx_buffer != NULL &&
1500 card->tx_buffer->count + sizeof(struct lcs_header) + 1500 card->tx_buffer->count + sizeof(struct lcs_header) +
1501 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE) 1501 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
@@ -1506,7 +1506,8 @@ __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1506 card->tx_buffer = lcs_get_buffer(&card->write); 1506 card->tx_buffer = lcs_get_buffer(&card->write);
1507 if (card->tx_buffer == NULL) { 1507 if (card->tx_buffer == NULL) {
1508 card->stats.tx_dropped++; 1508 card->stats.tx_dropped++;
1509 return -EBUSY; 1509 rc = -EBUSY;
1510 goto out;
1510 } 1511 }
1511 card->tx_buffer->callback = lcs_txbuffer_cb; 1512 card->tx_buffer->callback = lcs_txbuffer_cb;
1512 card->tx_buffer->count = 0; 1513 card->tx_buffer->count = 0;
@@ -1518,13 +1519,18 @@ __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1518 header->type = card->lan_type; 1519 header->type = card->lan_type;
1519 header->slot = card->portno; 1520 header->slot = card->portno;
1520 memcpy(header + 1, skb->data, skb->len); 1521 memcpy(header + 1, skb->data, skb->len);
1522 spin_unlock(&card->lock);
1521 card->stats.tx_bytes += skb->len; 1523 card->stats.tx_bytes += skb->len;
1522 card->stats.tx_packets++; 1524 card->stats.tx_packets++;
1523 dev_kfree_skb(skb); 1525 dev_kfree_skb(skb);
1524 if (card->tx_emitted <= 0) 1526 netif_wake_queue(card->dev);
1527 spin_lock(&card->lock);
1528 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1525 /* If this is the first tx buffer emit it immediately. */ 1529 /* If this is the first tx buffer emit it immediately. */
1526 __lcs_emit_txbuffer(card); 1530 __lcs_emit_txbuffer(card);
1527 return 0; 1531out:
1532 spin_unlock(&card->lock);
1533 return rc;
1528} 1534}
1529 1535
1530static int 1536static int
@@ -1535,9 +1541,7 @@ lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1535 1541
1536 LCS_DBF_TEXT(5, trace, "pktxmit"); 1542 LCS_DBF_TEXT(5, trace, "pktxmit");
1537 card = (struct lcs_card *) dev->priv; 1543 card = (struct lcs_card *) dev->priv;
1538 spin_lock(&card->lock);
1539 rc = __lcs_start_xmit(card, skb, dev); 1544 rc = __lcs_start_xmit(card, skb, dev);
1540 spin_unlock(&card->lock);
1541 return rc; 1545 return rc;
1542} 1546}
1543 1547
@@ -2319,7 +2323,6 @@ __init lcs_init_module(void)
2319 PRINT_ERR("Initialization failed\n"); 2323 PRINT_ERR("Initialization failed\n");
2320 return rc; 2324 return rc;
2321 } 2325 }
2322
2323 return 0; 2326 return 0;
2324} 2327}
2325 2328