Date: Wed, 17 Nov 2004 19:29:10 -0500 From: Chuck Swiger <cswiger@mac.com> To: Emanuel Strobl <Emanuel.Strobl@gmx.net> Cc: freebsd-current@freebsd.org Subject: Re: serious networking (em) performance (ggate and NFS) problem Message-ID: <419BECD6.8010008@mac.com> In-Reply-To: <200411180031.36222.Emanuel.Strobl@gmx.net> References: <200411172357.47735.Emanuel.Strobl@gmx.net> <1100733439.21798.36.camel@server.mcneil.com> <200411180031.36222.Emanuel.Strobl@gmx.net>
next in thread | previous in thread | raw e-mail | index | archive | help
Emanuel Strobl wrote: [ ... ] > No, because I observed similar bad performance with my fileserver which is > almost the same HW and it's em (Intel GbE) is connected to the local > 100baseTX segment. Can you mention a little more about your hardware, or perhaps put a dmesg on a website somewhere? If you don't have PCI-E hardware, especially if you are using classic 32-bit/33MHz PCI rather than a GbE adaptor via your mainboard's chipset, you're going to be limited by PCI bus throughput. [I'd still expect you to be going faster if this was the case, however.] Also, have you done any tuning of NMBCLUSTERS or the net.inet sysctls? > I explicitly avoided to go via any switch/hub to eliminate further problems. > I wonder if anybody has ever been able to transfer more than 17MB/s via IP > anyway? Sure. I've got a pair of Apple Xserves in a rack which got ~90 MB/s FTP for five ~600MB CD-ROM ISO images via a 3com gigabit switch. The machine doing the writing was using a four-disk RAID-10 setup via the internal SATA-150 drive bays, but I paused between each transfer so some of that transfer rate may be due to stuff in RAM but not yet flushed to disk, so take that number cum grano salis. > I need this performance for mirroring via ggate, so I'm thinking about fwe (IP > over Firewire). > Perhaps somebody has tried this already? If fwe gives reasonable transferrates > I guess the perfomance problem won't be found in ethernet but in IP. Well, I think Firewire is great and FreeBSD seems to have a very good implementation, so this might well be a reasonable alternative path. That being said, gigabit ethernet ought to do as well or better than Firewire if you can resolve this performance issue. -- -Chuck
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?419BECD6.8010008>