samba - Feb 2019 - 32 seconds vs 72 minutes -- expected performance difference?

On 16/02/2019 02:43, Saurabh Nanda via samba wrote:
>>> 2) Is this normal -- fs/cifs/smb2misc.c: Calculated size 157 length
156
>>> mismatch mid 11907
>> Could be a bug or miscalculated length + non critical warning, I also
>> see this on master kernel. Either way I doubt it's slowing
everything down.
>>
> Should I file a bug for this?
>
>
>> ## OPERATION 1 -  `ls debug.log` -- simply listing a single file. Does
>>> anything seem wrong with this?
>> This is going to be disapointing but we don't see the error that
gets
>> added in the stats in this log extract. Have you checked your samba
logs
>> as well? There might be useful information in there (might have to
>> increase "log level" in smb.conf, it can go up to 10 but that
will
>> generate a *lot* of data).
>>
>> If you still don't want to share the network capture you should at
least
>> try to open it yourself in wireshark, it would save everyone time.
>>
> I tried looking at the network capture using `tcpdump -A -X` but wasn't
> able to understand anything. I tried installing wireshark on a throwaway
> cloud instance, but realised that it's a GUI program. Can you please
help
> be with the network trace at
> https://www.dropbox.com/s/r8cn0qggrvmrpc3/dump.pcap?dl=0 ? It's
capturing
> the network chatter for ~1min of `ls -lR` on the shared folder. Does this
> help in getting to the bottom of this problem?
>
>
>> Also, please attach files or disable word-wrapping when you send logs
in
>> the future.
>>
> Ah - I thought most mailing lists scrub attachments.
>
> -- Saurabh.
This is a complete lateral jump. In the El/Centos line of distros I've 
seen a lot of issues caused by using the r8169 driver on 
RTL8111/8168/8411 cards including things like DNS failures and network 
slowdowns and other more exotic issues. The card performs better (in 
EL/Centos) with the r8168 driver which does not come built into the 
kernel, unless Ubuntu has unified the two drivers under the r8169 
banner. You can do a quick check with:
lspci -k | grep Eth -A 3

Please ignore this post if it is totally irrelevant.

Nick

>
>
> This is a complete lateral jump. In the El/Centos line of distros I've
> seen a lot of issues caused by using the r8169 driver on
> RTL8111/8168/8411 cards including things like DNS failures and network
> slowdowns and other more exotic issues. The card performs better (in
> EL/Centos) with the r8168 driver which does not come built into the
> kernel, unless Ubuntu has unified the two drivers under the r8169
> banner. You can do a quick check with:
> lspci -k | grep Eth -A 3

These kind of issues should show up in iperf as well, right?

On 16/02/2019 10:08, Saurabh Nanda wrote:
>
>
>     This is a complete lateral jump. In the El/Centos line of distros
>     I've
>     seen a lot of issues caused by using the r8169 driver on
>     RTL8111/8168/8411 cards including things like DNS failures and
>     network
>     slowdowns and other more exotic issues. The card performs better (in
>     EL/Centos) with the r8168 driver which does not come built into the
>     kernel, unless Ubuntu has unified the two drivers under the r8169
>     banner. You can do a quick check with:
>     lspci -k | grep Eth -A 3
>
>
> These kind of issues should show up in iperf as well, right?
DNS issues would not. Some of the other issues would not. Some may. I 
never checked. I've also seen issues where traffic to the device 
performed one way and and through the device performed the other, but I 
can't remember which was good and which was bad. It is a two second 
check and probably irrelevant but worth doing.