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add performance improvement for madwifi on low-memory systems 

SVN-Revision: 10850
lede-17.01
Felix Fietkau 2008-04-17 02:40:55 +00:00
parent eb34a3eff8
commit 94ddba360e
1 changed files with 178 additions and 0 deletions
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178
package/madwifi/patches/350-performance.patch Normal file
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@ -0,0 +1,178 @@
Index: madwifi-trunk-r3314/ath/if_ath.c
===================================================================
--- madwifi-trunk-r3314.orig/ath/if_ath.c 2008-04-17 02:56:31.000000000 +0200
+++ madwifi-trunk-r3314/ath/if_ath.c 2008-04-17 03:20:28.000000000 +0200
@@ -3237,7 +3237,6 @@
struct ath_softc *sc = dev->priv;
struct ieee80211_node *ni = NULL;
struct ath_buf *bf = NULL;
- struct ether_header *eh;
ath_bufhead bf_head;
struct ath_buf *tbf, *tempbf;
struct sk_buff *tskb;
@@ -3249,6 +3248,7 @@
*/
int requeue = 0;
#ifdef ATH_SUPERG_FF
+ struct ether_header *eh;
unsigned int pktlen;
struct ieee80211com *ic = &sc->sc_ic;
struct ath_node *an;
@@ -3314,27 +3314,9 @@
requeue = 1;
goto hardstart_fail;
}
-#endif
- /* If the skb data is shared, we will copy it so we can strip padding
- * without affecting any other bridge ports. */
- if (skb_cloned(skb)) {
- /* Remember the original SKB so we can free up our references */
- struct sk_buff *skb_new;
- skb_new = skb_copy(skb, GFP_ATOMIC);
- if (skb_new == NULL) {
- DPRINTF(sc, ATH_DEBUG_XMIT,
- "Dropping; skb_copy failure.\n");
- /* No free RAM, do not requeue! */
- goto hardstart_fail;
- }
- ieee80211_skb_copy_noderef(skb, skb_new);
- ieee80211_dev_kfree_skb(&skb);
- skb = skb_new;
- }
eh = (struct ether_header *)skb->data;
-#ifdef ATH_SUPERG_FF
/* NB: use this lock to protect an->an_tx_ffbuf (and txq->axq_stageq)
* in athff_can_aggregate() call too. */
ATH_TXQ_LOCK_IRQ(txq);
Index: madwifi-trunk-r3314/net80211/ieee80211_output.c
===================================================================
--- madwifi-trunk-r3314.orig/net80211/ieee80211_output.c 2008-04-17 02:56:30.000000000 +0200
+++ madwifi-trunk-r3314/net80211/ieee80211_output.c 2008-04-17 04:29:06.000000000 +0200
@@ -615,100 +615,45 @@
skb = skb_unshare(skb, GFP_ATOMIC);
}
-#ifdef ATH_SUPERG_FF
- if (isff) {
- if (skb == NULL) {
+ if (skb_cloned(skb) ||
+ (need_headroom > skb_headroom(skb)) ||
+ (!isff && (need_tailroom > skb_tailroom(skb)))) {
+
+ if (pskb_expand_head(skb, need_headroom, need_tailroom, GFP_ATOMIC)) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
- "%s: cannot unshare for encapsulation\n",
- __func__);
+ "%s: cannot expand storage (tail)\n", __func__);
vap->iv_stats.is_tx_nobuf++;
- ieee80211_dev_kfree_skb(&skb2);
-
+ ieee80211_dev_kfree_skb(&skb);
return NULL;
}
+ }
- /* first skb header */
- if (skb_headroom(skb) < need_headroom) {
- struct sk_buff *tmp = skb;
- skb = skb_realloc_headroom(skb, need_headroom);
- if (skb == NULL) {
- IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
- "%s: cannot expand storage (head1)\n",
- __func__);
- vap->iv_stats.is_tx_nobuf++;
- ieee80211_dev_kfree_skb(&skb2);
- return NULL;
- } else
- ieee80211_skb_copy_noderef(tmp, skb);
- ieee80211_dev_kfree_skb(&tmp);
- /* NB: cb[] area was copied, but not next ptr. must do that
- * prior to return on success. */
+#ifdef ATH_SUPERG_FF
+ if (isff) {
+ if (skb_shared(skb2)) {
+ /* Take our own reference to the node in the clone */
+ ieee80211_ref_node(SKB_CB(skb2)->ni);
+ /* Unshare the node, decrementing users in the old skb */
+ skb2 = skb_unshare(skb2, GFP_ATOMIC);
}
- /* second skb with header and tail adjustments possible */
- if (skb_tailroom(skb2) < need_tailroom) {
- int n = 0;
- if (inter_headroom > skb_headroom(skb2))
- n = inter_headroom - skb_headroom(skb2);
- if (pskb_expand_head(skb2, n,
- need_tailroom - skb_tailroom(skb2), GFP_ATOMIC)) {
- ieee80211_dev_kfree_skb(&skb2);
- IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
- "%s: cannot expand storage (tail2)\n",
- __func__);
- vap->iv_stats.is_tx_nobuf++;
- /* this shouldn't happen, but don't send first ff either */
- ieee80211_dev_kfree_skb(&skb);
- }
- } else if (skb_headroom(skb2) < inter_headroom) {
- struct sk_buff *tmp = skb2;
+ if ((skb_cloned(skb2) ||
+ (inter_headroom > skb_headroom(skb2)) ||
+ (need_tailroom > skb_tailroom(skb2)))) {
- skb2 = skb_realloc_headroom(skb2, inter_headroom);
- if (skb2 == NULL) {
+ if (pskb_expand_head(skb2, inter_headroom,
+ need_tailroom, GFP_ATOMIC)) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
- "%s: cannot expand storage (head2)\n",
- __func__);
+ "%s: cannot expand storage (tail)\n", __func__);
vap->iv_stats.is_tx_nobuf++;
- /* this shouldn't happen, but don't send first ff either */
ieee80211_dev_kfree_skb(&skb);
- skb = NULL;
- } else
- ieee80211_skb_copy_noderef(tmp, skb);
- ieee80211_dev_kfree_skb(&tmp);
- }
- if (skb) {
- skb->next = skb2;
+ ieee80211_dev_kfree_skb(&skb2);
+ return NULL;
+ }
}
- return skb;
+ skb->next = skb2;
}
#endif /* ATH_SUPERG_FF */
- if (skb == NULL) {
- IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
- "%s: cannot unshare for encapsulation\n", __func__);
- vap->iv_stats.is_tx_nobuf++;
- } else if (skb_tailroom(skb) < need_tailroom) {
- int n = 0;
- if (need_headroom > skb_headroom(skb))
- n = need_headroom - skb_headroom(skb);
- if (pskb_expand_head(skb, n, need_tailroom -
- skb_tailroom(skb), GFP_ATOMIC)) {
- IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
- "%s: cannot expand storage (tail)\n", __func__);
- vap->iv_stats.is_tx_nobuf++;
- ieee80211_dev_kfree_skb(&skb);
- }
- } else if (skb_headroom(skb) < need_headroom) {
- struct sk_buff *tmp = skb;
- skb = skb_realloc_headroom(skb, need_headroom);
- /* Increment reference count after copy */
- if (skb == NULL) {
- IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
- "%s: cannot expand storage (head)\n", __func__);
- vap->iv_stats.is_tx_nobuf++;
- } else
- ieee80211_skb_copy_noderef(tmp, skb);
- ieee80211_dev_kfree_skb(&tmp);
- }
return skb;
}