On Mon, Jan 18, 2010 at 11:50:55AM +0000, Stroller wrote: > Hi there, > > Yesterday I reseated the network cable between my server cupboard and my > desk, and it now lights up on the switch by my desk as gigabit. But a > file-transfer today is slower than I might have hoped. > > I'm not ruling out the cable, because it's pretty beat up (but the > switch *is* lighting up as 1000), but how do I determine, please, that > the Linux server at the other end is recognising the NIC and negotiating > as gigabit speeds?
mii-tool (net-tools) or ethtool should be able to tell you that > The hard-drives on the server are using an older PCI SATA card, and the > NIC is also PCI. But I would have expected it to be a bit faster than > 100Mbps. > > Any estimates over what kind of speed I should be seeing for large > file-transfers over Samba? Wildly ball-park is fine - I wouldn't expect a > 10x speed increase, but maybe 2x or 3x - 4x would be great! don't know about samba, but with scp or nfs I can get about 20MByte/s which is the speed of my disk (and for scp almost what my cpu can manage ;) scp-ing /dev/zero gets me something short of 30MBye/s but that is because my CPU cannot manage more ;) You can see an estimate of your "raw" speed between the two machines by running nc -l -p 7777 | pv >/dev/null on one computer and pv /dev/zero | nc OTHER_COMPUTER 7777 on the other. I don't have a 1gbit switch here right now, so can't give you an estimate (with two notebooks connected directly by cable I just got 100MByte/s, which is near enough to the theoretical maximum ;) (pv is like cat, but displays a progressbar with act. speed, sys-apps/pv) you can also try netperf for more precise benchmarks > > I'll be testing between my Macs (both on the desktop switch, ruling out > both the Linux box and the suspicious cable) later today, I'd just like > some ideas of where I should be starting from. > > Right now I'm seeing 10 gigs of .mp4 files (1gb - 2gb per video file) > taking about an hour - that's about what I'd expect from old 100Mbps > networking, not this shiny new stuff. hmm, that seems a bit low even for 100mbit, I have usually no problem getting cca 10 MByte/s with 100mbit switches (without other traffic), though I use either nfs or scp the only time I remember using samba was with a winxp server, which didn't go above 1MB/s, but I suspect that the problem was either on the win side or some misunderstanding between win and linux ;) > > I'm not seeing any difference commenting & uncommenting "aio read size = > 1, aio write size = 1" (separate lines) from /etc/samba/smb.conf and > then running `/etc/init.d/samba reload`, but maybe I shouldn't expect > that to make any difference on an existing transfer. I just don't want > to interfere with this right now - I just want to copy as much as > possible on to my laptop before I go out, and I'll take a look at this > performance issue when I get home. > > Thanks in advance for any suggestions or pointers, > > Stroller. > yoyo
