Re: [Linux-decnet-user] Restore performance

[David M. <da...@mi...>]

On 4/22/2004 11:05 AM +0100, Patrick Caulfield wrote:
>Well, I'm interested now (and the server is down at work...)
>
>I just tried this with a 260MB disk image on a MicroVAX 3100-95
>
>   backup/image dka100: 1.10"patrick password"::test.bck/save
>
>took 7 minutes
>
>   backup 1.10"patrick password"::test.bck/save/list=nl:
>
>took 6 minutes (nice and symmetrical)
>
>   backup 1.10"patrick password"::test.bck/save dka100:[pjctest...]
>
>took 20 minutes !
>
>The really odd thing is that the fal logs for the last two are almost 
>identical.
>This is on a home 10Mb/s network (at least the VAX only has 10Meg ethernet
>in it) so it's guaranteed quiet and so is the server (dual PIII/750)
>
>So, more detailed invesetigation needed..any VMS experts have ideas ??
>
>patrick


Gack, haven't done this in eons... so I'm rusty.  Some ideas FWIW:

Do you get a DAP block mode transfer in each direction?
(presumbly the push does, but what about the pull on the restore)

Do you have inter-packet timings on the NSP credit flow?
(which node is slowing things down?)
Either the VAX is blocking the dataflow (cuz it's slow processing or needs 
more buffering), or the Linux FAL is slow to send the next block.

Hmm... I still have some hardcopies of my DAP protocol reference card.
(Softcopy is in a Xerox Star file)
I should scan it.

Dave.