Date: Mon, 29 Sep 2008 14:33:49 -0700 From: "pete wright" <nomadlogic@gmail.com> To: "Holger Kipp" <hk@alogis.com> Cc: "firmdog@gmail.com" <firmdog@gmail.com>, Jeremy Chadwick <koitsu@freebsd.org>, stable@freebsd.org, net@freebsd.org Subject: Re: 7.1-PRERELEASE : bad network performance (nfe0) Message-ID: <57d710000809291433n2d8f48ebv9e54f868a7422654@mail.gmail.com> In-Reply-To: <20080929090310.GA70418@intserv.int1.b.intern> References: <wptzc1gu9v.fsf@heho.snv.jussieu.fr> <fa1676af0809281043k269b3d78sbf1e8006f2aa282e@mail.gmail.com> <20080928205300.GF60230@in-addr.com> <fa1676af0809281515x64e93d8fs9b2002d83b909f7a@mail.gmail.com> <20080928222414.GA90269@icarus.home.lan> <fa1676af0809281530x6b52f4c0n9854aac1f6a33d37@mail.gmail.com> <20080929090310.GA70418@intserv.int1.b.intern>
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On Mon, Sep 29, 2008 at 2:03 AM, Holger Kipp <hk@alogis.com> wrote: > On Sun, Sep 28, 2008 at 06:30:03PM -0400, firmdog@gmail.com wrote: >> No....you misunderstood. The 7.1 box was connected to a 5.4 box doing a 50GB >> data transfer over rsync. Both nics were 1000 full duplex with a crossover cable. >> The speed performance was terrible and I could only get up to 10 Mb/s and there >> was NO switch involved. I believe there is a problem or bug involved with the >> driver. Have the drivers or stack been updated in 7.1? What else can I provide? > > Hi, I only flipped through the messages in this thread, faintly remembering someone > writing something about ssh. Anyway, if you're copying using ssh (scp, sftp), then > the transfer rate is much less than what you'd expect - due to the encryption/decryption > overhead (unless you have hardware acceleration on both sideds). > FWIW I think the general issue for the ssh suite of tools is the compiled in window size is not tuned for large transfers like this: http://www.psc.edu/networking/projects/hpn-ssh/theory.php we use a propritary tool called aspera to overcome these issues when moving large amounts of data b/w remote sites on our WAN: http://www.asperasoft.com/products/scp/index.html the encrytp/decrypt overhead should be pretty minimal on modern hardware, so i would not expect that to be the first bottle neck you run into. -pete -- ~~o0OO0o~~ Pete Wright www.nycbug.org NYC's *BSD User Group
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