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D9120.diff
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Index: head/sys/dev/sfxge/sfxge_tx.c
===================================================================
--- head/sys/dev/sfxge/sfxge_tx.c
+++ head/sys/dev/sfxge/sfxge_tx.c
@@ -363,8 +363,22 @@
KASSERT(!txq->blocked, ("txq->blocked"));
+#if SFXGE_TX_PARSE_EARLY
+ /*
+ * If software TSO is used, we still need to copy packet header,
+ * even if we have already parsed it early before enqueue.
+ */
+ if ((mbuf->m_pkthdr.csum_flags & CSUM_TSO) &&
+ (txq->tso_fw_assisted == 0))
+ prefetch_read_many(mbuf->m_data);
+#else
+ /*
+ * Prefetch packet header since we need to parse it and extract
+ * IP ID, TCP sequence number and flags.
+ */
if (mbuf->m_pkthdr.csum_flags & CSUM_TSO)
prefetch_read_many(mbuf->m_data);
+#endif
if (__predict_false(txq->init_state != SFXGE_TXQ_STARTED)) {
rc = EINTR;
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D9120: sfxge(4): avoid unnecessary mbuf data prefetch
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