New kernel test: download unstable

[uelpenich]

To test the new kernel I did some heavy copy jobs.
I used a set of 16 binary files, each 1GByte large, and copied them from a Windows10 laptop with SDD to a 2big2 NAS with the latest kernel UIMAGE-433-KIRKWOOD-7. Network wired ethernet and a gigabit switch.
I created and checked md5 checksums.

1) from Windows10 laptop to 2big2: o.k. speed ~25MBytes / s
2) from 2big2 to Windows10 laptop: unstable. ~60MBytes / s
Network disconnection after 2 . . 6 GBytes of data, ~1 of 16 files had md5 checksum error.

[Jocko]

Hi werner

Yes we have detected this issue on 4.3.3 version mainly when you use rsync. You should have some errors reported in dmesg (about tiny fragment)

[fvdw]

I compiled a new 4.3.3 kernel with a patch to could solve this issue, see here

viewtopic.php?f=4&t=2345&p=22201#p22201

[uelpenich]

Success.
I did the same copy test as above.

Results:
no network disconnections, all md5 checksums are correct.
downloadspeed slightly lower ~57 MBytes / s
no entry in dmesg.

[fvdw]

thkx werner , I get the same result, Jocko is still reporting that he gets errors

[Jocko]

Hi Werner,

Can you try to do this:
- make a backup from a folder containing few large files (filesize > 1,5 GB)
- play a video if you have
- in the same time, try to make either a samba transfer with a large file or run a 2d backup still from a folder with several large files.

So when backup or transfer are ended, check if you do not have this warning message

Code: Select all

[ 1307.851310] mv643xx_eth_port mv643xx_eth_port.0 eth0: failed to linearize skb with tiny unaligned fragment

Note: I did not get them at each time (but around 2 times on 3)