Date: Sat, 17 Jan 2004 15:48:25 -0700 From: Brad Davis <bdavis@kenisis.com> To: "'freebsd-stable@freebsd.org'" <freebsd-stable@freebsd.org> Subject: Re: Odd lag/hanging issue with production ftp server - Please help AS AP! Message-ID: <20040117224825.GA48895@mccaffrey.house.so14k.com> In-Reply-To: <34BD9C97B714D511B01C00D0B73EC07303EEE65B@mail.opentable.com> References: <34BD9C97B714D511B01C00D0B73EC07303EEE65B@mail.opentable.com>
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Elliott, You might try downloading a file from the internet to locate where the problem is. Or a different FTP server. Etc. Keep trying to narrow down where the problem is. Regards, Brad On Sat, Jan 17, 2004 at 02:24:51PM -0800, Elliott Freis wrote: > I am forwarding this to this list per recommendation. > > > Note on recent test: Trying to do a transfer on the public LAN off the ftp > server, I am only able to get a bursty 20k/s! down from the ftp server. > This was with nfs completely unmounted, ftping from a local drive so its not > an NFS problem. It should get a full 2-3mb a sec at least. It used to. Up > is still full speed. The machine has a Intel pro NIC, direct to a Cisco > ArrowPoint. Both are set to 100 FD. ifconfig_fxp2="inet 66.151.XXX.XXX > netmask 255.255.255.224 media 100baseTX" > > Any help GREATLY appreciated, I have exhausted all avenues I can think of, > including hardware swaps. Here is some diag: > > last pid: 49903; load averages: 0.12, 0.20, 0.25 > up 0+15:19:19 14:19:00 > 73 processes: 1 running, 72 sleeping > CPU states: 1.4% user, 0.0% nice, 17.1% system, 2.3% interrupt, 79.2% > idle > Mem: 24M Active, 1233M Inact, 178M Wired, 68M Cache, 163M Buf, 3600K Free > Swap: 1024M Total, 12K Used, 1024M Free > > 353/17120/262144 mbufs in use (current/peak/max): > 271 mbufs allocated to data > 82 mbufs allocated to packet headers > 213/16806/65536 mbuf clusters in use (current/peak/max) > 37892 Kbytes allocated to network (19% of mb_map in use) > 0 requests for memory denied > 0 requests for memory delayed > 0 calls to protocol drain routines > > Name Mtu Network Address Ipkts Ierrs Opkts Oerrs > Coll > fxp2 1500 <Link#3> 00:02:a5:13:fc:b5 30214691 0 22672636 0 > 589096 > fxp2 1500 66.151.XXX.XXX ftp 30150589 - 22683851 > - - > fxp2 1500 fe80:3::202 fe80:3::202:a5ff: 0 - 0 - > - > > > -----Original Message----- > > From: Elliott Freis > > Sent: Friday, January 09, 2004 3:28 PM > > To: 'freebsd-questions@FreeBSD.ORG' > > Subject: Odd lag/hanging issue with production ftp server - Please > > help ASAP! > > > > I have been struggling with this one for over a month now. Here is a > > quick layout of my setup: > > > > Primary FTP server: > > Compaq DL380 1.5gb ram > > FreeBSD 4.5 > > 3x36gb RAID 5 drives as local boot/storage > > ProFTPd > > > > Array server for FTP: > > AMD Athlon 2200 512mb ram > > FreeBSD 4.8 > > 7x36gb Fiber channel drives, RAID 5 via Vinum. > > > > Both machines are connected via a cross-over cable, that has been tested > > good and swapped just in case. The primary storage for FTP is done on the > > Fiber drives via nfs from FTP to Array server. NFS options are -U -3. > > > > My problem is this. As more users connect and store files, the primary > > FTP machine becomes increasingly unresponsive. Currently, I max at about > > 350 concurrent FTP connections. The most basic test I have been doing is > > just holding down enter on an SSH session. As you hold enter down, you > > see it visually just hang for a second or more (up to about 5 seconds > > depending on the load). It is even worse if I spam "df -k" for example. > > For part of the time, it responds fine, though its randomly a second to > > multiple seconds. In other words, it is randomly responsive and not > > responsive every 5 seconds or so. During the "hanging" time, ftp sessions > > are also hung. So you see very bursty data transfers. Now thankfully, no > > ftp sessions drop, so we do get the data we need. But this is a terrible > > thing to be happening to a production server. > > > > One other thing of note, this happened to me about 4-5 months ago, but a > > reboot fixed it for some reason. So I concluded it was just a hiccup. > > But it has returned after a different reboot, and won't go away. > > > > Any help in troubleshooting this is very appreciated! Happy new year, > > > > -Elliott > > > > Example of "enter" latency (this is from a LAN connection): > > At shell prompt ">" > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"
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