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

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Date:   Wed, 25 Jul 2018 10:31:54 -0400
From:   Chuck Lever <chuck.lever@...cle.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Trond Myklebust <trondmy@...merspace.com>,
        "sudeep.holla@....com" <sudeep.holla@....com>,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Bruce Fields <bfields@...ldses.org>,
        Jeff Layton <jlayton@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Linux NFS Mailing List <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 Jul 25, 2018, at 9:27 AM, Krzysztof Kozlowski <krzk@...nel.org> wrote:
> 
> 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?

Hi Krzysztof, I don't know of any recent changes. Bisecting would be
a good place to start.


--
Chuck Lever