linux-kernel - Re: [BUG BISECT] NFSv4 client fails on Flush Journal to Persistent Storage

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Date:   Wed, 25 Jul 2018 15:27:46 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Chuck Lever <chuck.lever@...cle.com>
Cc:     Trond Myklebust <trondmy@...merspace.com>,
        "sudeep.holla@....com" <sudeep.holla@....com>,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Jeff Layton <jlayton@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, linux-nfs@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>
Subject: Re: [BUG BISECT] NFSv4 client fails on Flush Journal to Persistent Storage

On 18 June 2018 at 18:20, Chuck Lever <chuck.lever@...cle.com> wrote:
>
> The extra serialization appears to have a reproducible performance
> impact on RDMA, which no longer takes the reserve_lock when allocating
> a slot.
>
> I could put an xprt_alloc_xid call in xprt_alloc_slot, but that would
> only work for socket-based transports. Would it be OK if RDMA had its
> own XID allocation mechanism?

Hi,

On recent next the issue appeared again. My boards with NFSv4 root
timeout on 80% of boots. This time my NFS server is faster - Pi3 B+
:).

Is this know? Should I start long bisect or maybe you can point me to
possible causes?

Best regards,
Krzysztof