From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?utf-8?Q?Aur=C3=A9lien?= Aptel Subject: Re: Fwd: backing up to a Drobo CIFS VFS: Error -11 sending data on socket to server, Bufferbloat? Date: Fri, 12 May 2017 13:49:11 +0200 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT To: Robert Kudyba , linux-cifs Return-path: In-Reply-To: Sender: linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Hi Robert, The capture you posted unfortunately does not contain anything of worth looking at I think. Only 2 SMB packets. % tshark -r capture.pcap -Y 'smb||smb2' 1130 15.032933 150.108.64.56 → 150.108.68.23 SMB 144 Trans2 Request, QUERY_PATH_INFO, Query File All Info, Path: 1131 15.034786 150.108.68.23 → 150.108.64.56 SMB 204 Trans2 Response, QUERY_PATH_INFO Given your kernel log message I would expect seeing the reconnecting happen. I would wrap your backup script like so to get the right capture: capfile="$(date -Ihours)" tcpdump -w "$capfile" port 445 & cappid=$! sleep 2 ......... sleep 2 kill -6 $cappid -- Aurélien Aptel / SUSE Labs Samba Team GPG: 1839 CB5F 9F5B FB9B AA97 8C99 03C8 A49B 521B D5D3 SUSE Linux GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)