cdysthe
Regular Contributor
Hi,
I often transfer files over wi-fi to a NAS connected to my RT-N66U. I run Ubuntu 13.10 on my laptop and I usually get transfer speeds right around 6 MBps which is decent enough being on wi-fi. I use Samba to for my network Then recently the speed dropped to 1-2 MBps and I had no idea why. I looked at recent updates to my OS and I had just done a kernel upgrade. I then booted the previous version of the kernel and the speed went back up again. I also tried two of the newer mainline kernels, 3.12 and 3.13 from the Ubuntu kernel repo. With 3.12 the speed was still down between 1 - 2 MBps. but with the 3.13 kernel it was up to above 7 MBps, faster than with any other kernel. Why is it such a big difference between kernel versions even between the 3.11 kernels where the initial one that came with 13.10 had the higher upload speed while the latest upgrade 3.11.0.14.15 is slow? I have asked on Ubuntu forums also, but haven't gotten any good answers so I though I would ask here.
Just to be clear. I have tested this so many times now that there's no doubt this has to do with which kernel I am running and not load on my network since I have made sure I am the only one transferring files when I am testing. For now I am running the 3.13 kernel since it works fine and I need the extra speed, but I would like to know why this happens and where I could start looking for the reason.
I often transfer files over wi-fi to a NAS connected to my RT-N66U. I run Ubuntu 13.10 on my laptop and I usually get transfer speeds right around 6 MBps which is decent enough being on wi-fi. I use Samba to for my network Then recently the speed dropped to 1-2 MBps and I had no idea why. I looked at recent updates to my OS and I had just done a kernel upgrade. I then booted the previous version of the kernel and the speed went back up again. I also tried two of the newer mainline kernels, 3.12 and 3.13 from the Ubuntu kernel repo. With 3.12 the speed was still down between 1 - 2 MBps. but with the 3.13 kernel it was up to above 7 MBps, faster than with any other kernel. Why is it such a big difference between kernel versions even between the 3.11 kernels where the initial one that came with 13.10 had the higher upload speed while the latest upgrade 3.11.0.14.15 is slow? I have asked on Ubuntu forums also, but haven't gotten any good answers so I though I would ask here.
Just to be clear. I have tested this so many times now that there's no doubt this has to do with which kernel I am running and not load on my network since I have made sure I am the only one transferring files when I am testing. For now I am running the 3.13 kernel since it works fine and I need the extra speed, but I would like to know why this happens and where I could start looking for the reason.
