Small NCP packets for large file read

I am running the lastest 4.91sp4 client and am getting really slow
performance through a application called bimap which reads and processes
large map files. When these files are on a Netware server (OES or 6.5 NSS
volume), Ethereal shows that NCP read requests are for only 512bytes and
then an NCP read OK is returned with 512bytes worth of data. This takes
the program several minutes to read the file and process. When the same
files sits on a Micrsoft Server Ethereal shows bursts of TCP packets all
with 1500bytes of data, resulting in a much faster load.
LIP is turned on and seems to work OK when copying files around NetWare
server, I see the bursts of 1500bytes of data, but doesn't seem to work
when using this bimap application. Any ideas?

Hi,
Sasha wrote:
>
> Their not on the same segments, the routers are all correct according to
> our Networks team. Ethereal definateley shows the NCP read request as
> 512Bytes. Other applications such as Word opening large files are OK from
> same PC, Ethereal shows NCP request of 4096. Once again using the Bimap
> app and reading the same files stored on a Microsoft Server works OK as
> well. My understanding with LIP is that the large packet size will try and
> be negotiated, if it fails it reverts to it's default of 512. I assume it
> is failing and I don't know why?
It sounds like the application is specifically reading 512 byte
fragments on purpose. The fact you see bigger reads on Windows is likely
because on windows oplocking (caching) is enabled, but isn't on Netware.
CU,
Massimo Rosen
Novell Product Support Forum Sysop
No emails please!
http://www.cfc-it.de

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