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Subject: Re: [PATCH] xprtrdma: Make sure Send CQ is allocated on an existing
 CPU
From:   Chuck Lever <chuck.lever@oracle.com>
In-Reply-To: <3f5da1e4-99f1-8376-a291-e50a7d52c303@suse.com>
Date:   Wed, 23 Jan 2019 11:51:49 -0500
Cc:     linux-rdma@vger.kernel.org,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>
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Message-Id: <BF1A6DC0-FF34-4B80-8602-6B122AD5ABFD@oracle.com>
References: <3f5da1e4-99f1-8376-a291-e50a7d52c303@suse.com>
To:     Nicolas Morey-Chaisemartin <nmoreychaisemartin@suse.com>
Sender: linux-nfs-owner@vger.kernel.org
Precedence: bulk

Hi Nicolas-

> On Jan 23, 2019, at 8:12 AM, Nicolas Morey-Chaisemartin =
<nmoreychaisemartin@suse.com> wrote:
>=20
> Make sure host has at least 2 CPU before allocating to CPU#1

The fourth parameter of ib_alloc_cq() is not a CPU number,
it's a completion vector number. What failure did you see
that prompted this patch?


> Fixes: a4699f5647f3 (xprtrdma: Put Send CQ in IB_POLL_WORKQUEUE mode)
> Signed-off-by: Nicolas Morey-Chaisemartin =
<nmoreychaisemartin@suse.com>
> ---
> net/sunrpc/xprtrdma/verbs.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>=20
> diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
> index b725911c0f3f..36aa7b2648e4 100644
> --- a/net/sunrpc/xprtrdma/verbs.c
> +++ b/net/sunrpc/xprtrdma/verbs.c
> @@ -546,7 +546,7 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct =
rpcrdma_ia *ia,
>=20
> 	sendcq =3D ib_alloc_cq(ia->ri_device, NULL,
> 			     ep->rep_attr.cap.max_send_wr + 1,
> -			     1, IB_POLL_WORKQUEUE);
> +			     num_online_cpus() > 1 ? 1 : 0, =
IB_POLL_WORKQUEUE);
> 	if (IS_ERR(sendcq)) {
> 		rc =3D PTR_ERR(sendcq);
> 		dprintk("RPC:       %s: failed to create send CQ: %i\n",
> --=20
> 2.18.0
>=20

--
Chuck Lever