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| author | sephe <sephe@FreeBSD.org> | 2016-04-11 06:31:52 +0000 |
|---|---|---|
| committer | sephe <sephe@FreeBSD.org> | 2016-04-11 06:31:52 +0000 |
| commit | c49d153732add588250197d631d76ec1539965e4 (patch) | |
| tree | a646b643cdd5a10924c232e77c0554d6e01222b2 | |
| parent | 710f9bdd7a9e9726409854be3cc2246048cd3c74 (diff) | |
| download | FreeBSD-src-c49d153732add588250197d631d76ec1539965e4.zip FreeBSD-src-c49d153732add588250197d631d76ec1539965e4.tar.gz | |
hyperv/hn: Cap default # of rings to 8.
8 gives the best performance in both Azure and local Hyper-V on both
10Ge and 40Ge. More rings are still allowed by manual configuration.
Reviewed by: Dexuan Cui <decui microsoft com>
MFC after: 1 week
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D5879
| -rw-r--r-- | sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c b/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c index acc49b4..fb0e8e5 100644 --- a/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c +++ b/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c @@ -136,6 +136,8 @@ __FBSDID("$FreeBSD$"); #define HN_LROENT_CNT_DEF 128 +#define HN_RING_CNT_DEF_MAX 8 + #define HN_RNDIS_MSG_LEN \ (sizeof(rndis_msg) + \ RNDIS_HASH_PPI_SIZE + \ @@ -460,8 +462,14 @@ netvsc_attach(device_t dev) * The # of RX rings to use is same as the # of channels to use. */ ring_cnt = hn_chan_cnt; - if (ring_cnt <= 0 || ring_cnt > mp_ncpus) + if (ring_cnt <= 0) { + /* Default */ + ring_cnt = mp_ncpus; + if (ring_cnt > HN_RING_CNT_DEF_MAX) + ring_cnt = HN_RING_CNT_DEF_MAX; + } else if (ring_cnt > mp_ncpus) { ring_cnt = mp_ncpus; + } tx_ring_cnt = hn_tx_ring_cnt; if (tx_ring_cnt <= 0 || tx_ring_cnt > ring_cnt) |
