[OpenAFS] 1.3.x memcache performance

[Horst Birthelmer]

On Dec 27, 2004, at 3:48 PM, Andrej Filipcic wrote:

>
> Hi,
>
> I have checked diskcache/memcache performance over an ADSL link.
> The link has 4M download and 512k upload bandwidth. Although there are 
> still
> problems with disk cache, the copy from afs to local disk is good 
> enough.
> With disk cache the speed is ~400 kbyte/s (tcp speed is 500 kbyte/s).
> Memcahe speed is much lower, between 120 and 160 kbyte/s, depending on 
> the
> fileserver. Is there any reason (bug) for such a big difference?
>
> On gigabit network, the copy speed with memcache is never larger than 
> 20
> mbyte/s, with disk cache it can go up to 70 mbyte/s.

Can you provide more information on your measuring and test environment?
I suppose you didn't actually measured AFS performance when you got 70 
MB/s with diskcache. That's pretty unlikely.

Horst