Elliott Freis
2004-Jan-18 14:56 UTC
Odd lag/hanging issue with production ftp server - Please hel p AS AP!
Perfect, the solution was indeed to set it to full duplex. My Arrowpoint was set to full duplex, and I did not have the mediaopt set at all. This corrected the lag. Thanks to all who responded, you hit the nail on the head. -Elliott -----Original Message----- From: Sean Winn [mailto:sean@gothic.net.au] Sent: Sunday, January 18, 2004 8:06 AM To: Elliott Freis Subject: Re: Odd lag/hanging issue with production ftp server - Please help AS AP! 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 theftp> 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 itsnot> 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" >ifconfig fxp2 media 100baseTX usually only does half-duplex, not full-duplex ifconfig fxp2 media 100basetx mediaopt full-duplex is probably what you're looking for> 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" >