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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:e::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-102.9 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_NONE,USER_IN_WELCOMELIST,USER_IN_WHITELIST autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: [PATCH v2] fs: nfs: Start earlier to resend requests X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) On Fri, Jun 11, 2021 at 09:13:51AM +0200, Uwe Kleine-K=F6nig wrote: > On a customer site we're experience a bit over 1% UDP packet loss. When > wiresharking an NFS transfer of a kernel image (with the goal to boot > via NFS) I saw 64 of 2555 RPC calls staying unanswered. With the current > timeout setting each of them introduces a delay of 2 seconds and the > whole transfer takes 137s. With the timeout reduced to 0.1s the transfer > time is not optimal (going down to approx 15 seconds) but at least it > becomes bearable. > = > To still cope with a slow network (in contrast to an unreliable as > pictured above) increase NFS_MAX_RESEND to keep NFS_TIMEOUT * > NFS_MAX_RESEND (which defines the overall timeout before aborting the > transfer) constant. > = > Signed-off-by: Uwe Kleine-K=F6nig Acked-by: Gavin Schenk I have tested this on the customer site with 1% UDP loss :). I am working w= ith the IT department to get a better network. Until that happens, this patch h= elps me successfully boot NFS. Regards Gavin Schenk _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox