[OpenAFS] low write/read performance with 1.8.x 1.9.0 client

[Giovanni Bracco]

I have seen that the first release of OpenAFS 1.9.0 is out and so I 
thought that it was time to try at least 1.8.x and also 1.9 on our 
production Linux x86-64 nodes, where we have used 1.6.x up to now.

Our AFS cell has file servers with OpenAFS 1.6.x and while over WAN the 
performance can be rather poor, due to the well known rx latency 
problem, in the LAN we have values between 70 e 80 MB/s both for read 
and write. The clients are CentOS 6.x and 7.x all with OpenAFS 1.6.x.

So we have tried OpenAFS 1.8.6 clients on some production nodes (from 
CentOS 7.3 to 7.8) and the performance on LAN have been poor, 15 MB/s 
while the same nodes with 1.6.x clients has the normal performance.

Then we have installed a test AFS cell with OpenAFS 1.8.6 but no change 
and at that point I we have checked also on user desktops using ubuntu. 
1.8.4 and the performance are as low as for production nodes with 1.8.x 
release.
No improvement going to 1.9.0 (both server and clients) either.

Any suggestion?
Are we missing something important?
No special tuning in our installation.

Giovanni


-- 
Giovanni Bracco
phone  +39 351 8804788
E-mail  giovanni.bracco@enea.it
WWW http://www.afs.enea.it/bracco


==================================================

Questo messaggio e i suoi allegati sono indirizzati esclusivamente alle persone indicate e la casella di posta elettronica da cui e' stata inviata e' da qualificarsi quale strumento aziendale.
La diffusione, copia o qualsiasi altra azione derivante dalla conoscenza di queste informazioni sono rigorosamente vietate (art. 616 c.p, D.Lgs. n. 196/2003 s.m.i. e GDPR Regolamento - UE 2016/679).
Qualora abbiate ricevuto questo documento per errore siete cortesemente pregati di darne immediata comunicazione al mittente e di provvedere alla sua distruzione. Grazie.

This e-mail and any attachments is confidential and may contain privileged information intended for the addressee(s) only.
Dissemination, copying, printing or use by anybody else is unauthorised (art. 616 c.p, D.Lgs. n. 196/2003 and subsequent amendments and GDPR UE 2016/679).
If you are not the intended recipient, please delete this message and any attachments and advise the sender by return e-mail. Thanks.

==================================================