Date: Thu, 9 Aug 2018 21:52:52 +0000 (UTC) From: Navdeep Parhar <np@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r337553 - head/sys/dev/cxgbe Message-ID: <201808092152.w79LqqWU097915@repo.freebsd.org>
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Author: np Date: Thu Aug 9 21:52:51 2018 New Revision: 337553 URL: https://svnweb.freebsd.org/changeset/base/337553 Log: cxgbe(4): Add a sysctl to control the tx credit reclaim mechanism for netmap tx queues. There is no change in default behavior. Sponsored by: Chelsio Communications Modified: head/sys/dev/cxgbe/t4_netmap.c Modified: head/sys/dev/cxgbe/t4_netmap.c ============================================================================== --- head/sys/dev/cxgbe/t4_netmap.c Thu Aug 9 21:28:31 2018 (r337552) +++ head/sys/dev/cxgbe/t4_netmap.c Thu Aug 9 21:52:51 2018 (r337553) @@ -93,6 +93,14 @@ int starve_fl = 0; SYSCTL_INT(_hw_cxgbe, OID_AUTO, starve_fl, CTLFLAG_RWTUN, &starve_fl, 0, "Don't ring fl db for netmap rx queues."); +/* + * Try to process tx credits in bulk. This may cause a delay in the return of + * tx credits and is suitable for bursty or non-stop tx only. + */ +int lazy_tx_credit_flush = 1; +SYSCTL_INT(_hw_cxgbe, OID_AUTO, lazy_tx_credit_flush, CTLFLAG_RWTUN, + &lazy_tx_credit_flush, 0, "lazy credit flush for netmap tx queues."); + static int alloc_nm_rxq_hwq(struct vi_info *vi, struct sge_nm_rxq *nm_rxq, int cong) { @@ -571,8 +579,6 @@ ring_nm_txq_db(struct adapter *sc, struct sge_nm_txq * } nm_txq->dbidx = nm_txq->pidx; } - -int lazy_tx_credit_flush = 1; /* * Write work requests to send 'npkt' frames and ring the doorbell to send them
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