From: bfields@fieldses.org (J. Bruce Fields)
To: "suy.fnst@fujitsu.com" <suy.fnst@fujitsu.com>
Cc: "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
"jlayton@kernel.org" <jlayton@kernel.org>,
"trond.myklebust@hammerspace.com"
<trond.myklebust@hammerspace.com>,
"bfields@redhat.com" <bfields@redhat.com>
Subject: Re: [bug report] nfs clients fail to get read delegations after file open with O_RDWR
Date: Mon, 13 Dec 2021 16:55:50 -0500 [thread overview]
Message-ID: <20211213215550.GA2230@fieldses.org> (raw)
In-Reply-To: <OS3PR01MB7705959736BA3A5BDF9C0AFD89749@OS3PR01MB7705.jpnprd01.prod.outlook.com>
On Mon, Dec 13, 2021 at 03:39:26AM +0000, suy.fnst@fujitsu.com wrote:
> So I wonder if it's a real regression/bug or an expected "cost" of speedup on
> nfsd file caches?
Without looking at this case in detail:
Delegations are granted at the server's discretion, so this certainly
isn't a bug.
It might be suboptimal behavior. If there's evidence that this causes
significant regressions on some important workload, then we'd want to
look into fixing it.
--b.
next prev parent reply other threads:[~2021-12-13 21:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-13 3:39 [bug report] nfs clients fail to get read delegations after file open with O_RDWR suy.fnst
2021-12-13 21:55 ` J. Bruce Fields [this message]
2021-12-14 0:50 ` suy.fnst
2021-12-14 16:45 ` J. Bruce Fields
2021-12-14 17:19 ` Jeff Layton
2021-12-14 17:24 ` J. Bruce Fields
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