Date: Mon, 20 Feb 2006 04:27:21 -0500 From: "Xn Nooby" <xnooby@gmail.com> To: "Andrew Pantyukhin" <infofarmer@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: WinSCP mega-slowness Message-ID: <bdf25fde0602200127k71ce5c59kcde037bafbdba01b@mail.gmail.com> In-Reply-To: <cb5206420602200000k641671cdofb50601131c89622@mail.gmail.com> References: <bdf25fde0602192305m6fff3734x3333c3e1a41e3cf2@mail.gmail.com> <cb5206420602200000k641671cdofb50601131c89622@mail.gmail.com>
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Well, it's good to know I'm not the only one seing this. Right now both machines are running FreeBSD, since I gave up on waiting for Windows to cop= y the files. The CPU load on Window when sending 1 meg per second is usuall= y about 30%, while the Unix box is only at 1-2%. When I have 2 Unix boxes sending/receiving, I think the load is like 4-5% on both. I'm building a bunch of packages right now, so I can't get the exact number. I could try the openssh patch later in the week, that would be great if there was a unix-side fix for this. Of course as I run FreeBSD more, and Windows less, the problem will go away, too. thanks! On 2/20/06, Andrew Pantyukhin <infofarmer@gmail.com> wrote: > > On 2/20/06, Xn Nooby <xnooby@gmail.com> wrote: > > For about a year I have noticed that whenever my Windows boxes talk to > my > > Unix boxes, they communicate at about 1/10 normal speed. I copy lots > (300GB) > > of large files back and forth between machines as I try different OS's, > and > > I always see this. > > > > Specifically, if I copy from FreeBSD to FreeBSD, files transfer at 11 > megs > > per second. Between FreeBSD and Linux, at about 8 megs per > second. Between > > FreeBSD and Windows, about 1 megabyte per second. This is on identical > > hardware. I've told other people about this, and they usually say I > must be > > doing something wrong, but recently a friend of mine upgraded a Windows > box > > to SP2, and now they are getting this same slowness. When I copy from > > Windows to WIndows (XP or W2k), I get 11 megs per second. > > > > My machines are two P4's with gigabit NICs, and I'm using WinSCP and > > (somtimes) pscp.exe on WIndows to talk to sshd on FreeBSD. It's always > a > > shock when I have to copy my data to WIndows, and it takes 30 hours > instead > > of 3. > > > > Does anyone else ever see this slowness when copying files between > FreeBSD > > and Windows? > > > > Is Windows maybe capping the transfer speed when it talks to Unix? > > _______________________________________________ > > freebsd-questions@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > > To unsubscribe, send any mail to " > freebsd-questions-unsubscribe@freebsd.org" > > > > It is very certainly a known issue. Not that its specifics and > origins are clearly known, but most of us stumble upon it > sooner or later. You can usually achieve wire speed only > between two OSes of a kind. TCP/IP optimizations are > very important here: if they differ, performance plummets. > Depends on a multitude of things from quality of NICs to > weather in your area. I've never been able to get more > than 70Mbit/s between FreeBSD and Windows XP. I > always get 90-100Mbit/s between two BSDs or two Win's. > > As for your case, 1MB/s is a serious limit. What can you > tell us about CPU load? Interrupts? Can you try this: > http://www.psc.edu/networking/projects/hpn-ssh/ >
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