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Re: [Proftpd-user] Performance Help - Take 2
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From: John S. <jo...@st...> - 2025-12-02 23:11:49
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>>>>> "Brad" == Brad Knorr <br...@kn...> writes: > OK, thanks for the reply, after doing some googling and AI, I found > some tunable kernel parameters. Great! > # RECOMMENDED TUNING FOR HIGH-BANDWIDTH SERVERS (Optimized for SFTP) > # > # Increased to 16MB max buffers for high-latency/high-speed links. > net.core.rmem_max = 16777216 > net.core.wmem_max = 16777216 > # Set TCP read/write memory (min, default, max) > net.ipv4.tcp_rmem = 4096 87380 16777216 > net.ipv4.tcp_wmem = 4096 65536 16777216 > # Enable Google's BBR Congestion Control > net.core.default_qdisc = fq > net.ipv4.tcp_congestion_control = bbr > After a few queries to people, this seems to have helped. However as you > mentioned, it is really hard to know as we are at the mercy of the internet. > I think I have done everything I can. Again thank you for the reply. I strongly suspect you might be better off testing by spinning up some VMs in AWS around the world and testing out how it works. But you also don't give any information about your server's hardware and network configuration. So again, it's hard to help. Anyway, glad you've made progress. John > -----Original Message----- > From: John Stoffel <jo...@st...> > Sent: November 30, 2025 1:11 PM > To: pro...@li... > Subject: Re: [Proftpd-user] Performance Help - Take 2 >>>>> "Brad" == Brad Knorr <br...@kn...> writes: >> I realise my first post asking for help, wasn’t really helping myself, >> I didn’t really provide much context. So after some testing, here are >> the results I am getting. > Brad, > You still don't provide enough details to help. What type of server are you > running proftpd on? What OS? What does the system load look like when the > problem(s) are reported? > Have you spun up a new host in a new datacenter (or even another host in the > same datacenter) and tried having those users connect to your new test > instance? > Can they download from other places at a high speed? > Honestly, from the sound of it, your customers might have bad local > networks, but you nee to get them to run some tests to other known good > sites to see what their performance is as a comparison. >> Many of my customers are complaining about the download speed from >> proftpd. Here Is the testing I have done. This user is in Tampa Bay, >> Florida. > No, they're complaining about slow download speeds from your site. > And there's a multitude of possible bottlenecks here. Why have your > turned off SFTP compression? Does that help? > When you're downloading from other sites, how is the performance of your > sftp server? Is the system load high? Can you see the traffic flows and > measure your WAN/LAN performance? > What OS are you running proftpd on? > This is a tough problem to solve, because you don't have any control outside > of your system, so problems could be anywhere. Especially if your customer > is on a residential network. Who knows what they have and what they're > trying to do? > Also, speedtest isn't really a good test, I would suggest you have these > people try to download a smallish ISO file from ubuntu.com as a comparision. > Or maybe spin up a test linode instance in the cloude running a stripped > down copy of your setup, and have the users try that new system as a test. > If they're paying, then it's worth spending some money on trying to figure > out what's going wrong. But otherwise... it's a horrible rat hole to dive > down. > John >> iperf3 from >> 1. from France: 141 Mbits/sec >> 2. from nyc 249 Mbits/sec >> 3. from sfo 598 Mbits/sec >> 4. From Tampa (users come computer) 52.4 Mbits/sec 5. From inside my >> infrastructure, out to the gateway ip and back: 9.18 Gbits/sec >> >> The user is using Filezilla is sftp mode and is getting .5 Mbits/sec on a >> 10 GB file. >> >> When he does a speed check to the city where my data center is via >> speedtest.org he gets 200Mbits/ s >> >> When I do a scp from France on a 1GB file I get around 250 Mbits/s >> >> What am I running into here? Is this a limitation of Filezilla? I >> have done disk speed tests on the file server and get 3.2 GB/s on a 1G >> file read. >> >> Any thoughts on where to look next? >> >> Thanks for the awesome product btw. >> >> Proftpd version: >> root@nfs1:/home/truenorth# proftpd --version >> ProFTPD Version 1.3.9rc3 >> >> Config file: >> ServerName "File Transfer Server" >> ServerType standalone >> DefaultServer on >> Port 2222 >> UseIPv6 off >> Umask 003 >> MaxInstances 30 >> User nobody >> Group nogroup >> DefaultRoot ~ >> AllowOverwrite on >> MaxLoginAttempts 3 >> AllowRetrieveRestart on >> DeferWelcome on >> HiddenStores on >> DeleteAbortedStores on >> >> #sFTP config >> SFTPEngine on >> SFTPAuthMethods password >> SFTPOptions IgnoreSFTPUploadPerms IgnoreSCPUploadPerms >> IgnoreSFTPSetOwners IgnoreSFTPSetExtendedAttributes >> IgnoreSFTPUploadExtendedAttributes >> SFTPCompression off >> SFTPMaxChannels 10 >> RequireValidShell off >> SFTPHostKey /etc/ssh/ssh_host_rsa_key >> SFTPHostKey /etc/ssh/ssh_host_ecdsa_key >> >> # logging >> SyslogLevel warn >> SystemLog /var/log/proftpd/system.log >> TransferLog none >> >> # Bar use of SITE CHMOD by default >> <Limit SITE_CHMOD> >> DenyAll >> </Limit> >> >> _______________________________________________ >> ProFTPD Users List <pro...@pr...> >> Unsubscribe problems? >> http://www.proftpd.org/list-unsub.html > _______________________________________________ > ProFTPD Users List <pro...@pr...> > Unsubscribe problems? > http://www.proftpd.org/list-unsub.html > _______________________________________________ > ProFTPD Users List <pro...@pr...> > Unsubscribe problems? > http://www.proftpd.org/list-unsub.html |
