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[PATCH] s390: lcs performance enhancements

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[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>
This commit is contained in:
Frank Pavlic 2006-02-07 17:04:36 +01:00 • committed by Jeff Garzik
parent ca5b0ec8ae
commit 0d613a27cc
2 changed files with 18 additions and 15 deletions
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31
drivers/s390/net/lcs.c
View file

@ -98,9 +98,9 @@ lcs_register_debug_facility(void)
return -ENOMEM; return -ENOMEM;
} }
debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view); debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
debug_set_level(lcs_dbf_setup, 4); debug_set_level(lcs_dbf_setup, 2);
debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view); debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
debug_set_level(lcs_dbf_trace, 4); debug_set_level(lcs_dbf_trace, 2);
return 0; return 0;
} }
@ -1292,9 +1292,8 @@ lcs_set_multicast_list(struct net_device *dev)
LCS_DBF_TEXT(4, trace, "setmulti"); LCS_DBF_TEXT(4, trace, "setmulti");
card = (struct lcs_card *) dev->priv; card = (struct lcs_card *) dev->priv;
if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD)) { if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
schedule_work(&card->kernel_thread_starter); schedule_work(&card->kernel_thread_starter);
}
} }
#endif /* CONFIG_IP_MULTICAST */ #endif /* CONFIG_IP_MULTICAST */
@ -1459,6 +1458,8 @@ lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
lcs_release_buffer(channel, buffer); lcs_release_buffer(channel, buffer);
card = (struct lcs_card *) card = (struct lcs_card *)
((char *) channel - offsetof(struct lcs_card, write)); ((char *) channel - offsetof(struct lcs_card, write));
if (netif_queue_stopped(card->dev))
netif_wake_queue(card->dev);
spin_lock(&card->lock); spin_lock(&card->lock);
card->tx_emitted--; card->tx_emitted--;
if (card->tx_emitted <= 0 && card->tx_buffer != NULL) if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
@ -1478,6 +1479,7 @@ __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
struct net_device *dev) struct net_device *dev)
{ {
struct lcs_header *header; struct lcs_header *header;
int rc = 0;
LCS_DBF_TEXT(5, trace, "hardxmit"); LCS_DBF_TEXT(5, trace, "hardxmit");
if (skb == NULL) { if (skb == NULL) {
@ -1492,10 +1494,8 @@ __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
card->stats.tx_carrier_errors++; card->stats.tx_carrier_errors++;
return 0; return 0;
} }
if (netif_queue_stopped(dev) ) { netif_stop_queue(card->dev);
card->stats.tx_dropped++; spin_lock(&card->lock);
return -EBUSY;
}
if (card->tx_buffer != NULL && if (card->tx_buffer != NULL &&
card->tx_buffer->count + sizeof(struct lcs_header) + card->tx_buffer->count + sizeof(struct lcs_header) +
skb->len + sizeof(u16) > LCS_IOBUFFERSIZE) skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
@ -1506,7 +1506,8 @@ __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
card->tx_buffer = lcs_get_buffer(&card->write); card->tx_buffer = lcs_get_buffer(&card->write);
if (card->tx_buffer == NULL) { if (card->tx_buffer == NULL) {
card->stats.tx_dropped++; card->stats.tx_dropped++;
return -EBUSY; rc = -EBUSY;
goto out;
} }
card->tx_buffer->callback = lcs_txbuffer_cb; card->tx_buffer->callback = lcs_txbuffer_cb;
card->tx_buffer->count = 0; card->tx_buffer->count = 0;
@ -1518,13 +1519,18 @@ __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
header->type = card->lan_type; header->type = card->lan_type;
header->slot = card->portno; header->slot = card->portno;
memcpy(header + 1, skb->data, skb->len); memcpy(header + 1, skb->data, skb->len);
spin_unlock(&card->lock);
card->stats.tx_bytes += skb->len; card->stats.tx_bytes += skb->len;
card->stats.tx_packets++; card->stats.tx_packets++;
dev_kfree_skb(skb); dev_kfree_skb(skb);
if (card->tx_emitted <= 0) netif_wake_queue(card->dev);
spin_lock(&card->lock);
if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
/* If this is the first tx buffer emit it immediately. */ /* If this is the first tx buffer emit it immediately. */
__lcs_emit_txbuffer(card); __lcs_emit_txbuffer(card);
return 0; out:
spin_unlock(&card->lock);
return rc;
} }
static int static int
@ -1535,9 +1541,7 @@ lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
LCS_DBF_TEXT(5, trace, "pktxmit"); LCS_DBF_TEXT(5, trace, "pktxmit");
card = (struct lcs_card *) dev->priv; card = (struct lcs_card *) dev->priv;
spin_lock(&card->lock);
rc = __lcs_start_xmit(card, skb, dev); rc = __lcs_start_xmit(card, skb, dev);
spin_unlock(&card->lock);
return rc; return rc;
} }
@ -2319,7 +2323,6 @@ __init lcs_init_module(void)
PRINT_ERR("Initialization failed\n"); PRINT_ERR("Initialization failed\n");
return rc; return rc;
} }
return 0; return 0;
} }

2
drivers/s390/net/lcs.h
View file

@ -95,7 +95,7 @@ do { \
*/ */
#define LCS_ILLEGAL_OFFSET 0xffff #define LCS_ILLEGAL_OFFSET 0xffff
#define LCS_IOBUFFERSIZE 0x5000 #define LCS_IOBUFFERSIZE 0x5000
#define LCS_NUM_BUFFS 8 /* needs to be power of 2 */ #define LCS_NUM_BUFFS 32 /* needs to be power of 2 */
#define LCS_MAC_LENGTH 6 #define LCS_MAC_LENGTH 6
#define LCS_INVALID_PORT_NO -1 #define LCS_INVALID_PORT_NO -1
#define LCS_LANCMD_TIMEOUT_DEFAULT 5 #define LCS_LANCMD_TIMEOUT_DEFAULT 5