Date: Thu, 16 Dec 1999 19:28:34 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: Kevin Day <toasty@dragondata.com>, phk@critter.freebsd.dk (Poul-Henning Kamp), freebsd-current@FreeBSD.ORG Subject: Re: Serious server-side NFS problem Message-ID: <199912170328.TAA57721@apollo.backplane.com> References: <199912160758.BAA87332@celery.dragondata.com> <199912160801.AAA50074@apollo.backplane.com> <14425.33053.359447.429215@grasshopper.cs.duke.edu>
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:Matthew Dillon writes: : : > We're already testing a patch. : :Thanks again Matt! : :The latest rev of nfs_serv.c has fixed it. : :I'm now seeing FreeBSD UDP client read bandwidth of 9.2MB/sec & write :bandwidth of 10.9MB/sec. Solaris clients are writing over TCP at :10.1MB/sec (and that is across a router!) and are reading at 7MB/sec. : :Awesome! : :Thanks, : :Drew : :------------------------------------------------------------------------------ :Andrew Gallatin, Sr Systems Programmer http://www.cs.duke.edu/~gallatin :Duke University Email: gallatin@cs.duke.edu Those are really quite excellent results! Linux eat your heart out! I get 9.5 to 10.5 MBytes/sec on my half-duplex network between two fast machines. I tend to get between 7.5 and 9 MBytes/sec when using slower (200-300 MHz) clients. That's *with* packet loss (for some reason when my fxp ethernets pump data out that quickly they tend to cause packet loss in other parts of my HUBed network, which I find quite annoying). We've solved most of the performance issues, but NFS is still eating a little too much cpu for my tastes. Unfortunately it is getting to the point where a significant portion of the performance loss is occuring in the network driver itself. Some of my cards eat 25% of the cpu just in 'interrupt' (at 10 MBytes/sec half duplex), not even counting the TCP or UDP stacks. This is mainly due to the MTU being too small (i.e. packet fragmentation takes it toll on the interrupt subsystem). SCSI cards are way ahead of NIC cards in regards to reducing interrupt overhead (though gigabit NICs have caught up some). -Matt Matthew Dillon <dillon@backplane.com> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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