> OK. We are trying to build a data acquisition cum storage system using
fibre
channel host bus adaptors and fibre channel disks (JBOD). We plan to use
two
(or may be more depending on the loop performance) Fc-AL loops of 27
controllers each connected to an equal number of JBODs in the same loop.
All
the controllers are initiators and they write their assigned target hard
disk. This is a short description of the system.The problem: We built some cards (HBA) using Agilent HBFC-5100B FC
protocol
chips. The host processor on which these cards will reside is a 166 MMX
Pentium embedded processor running on Windows NTe OS. We would like to
know
what would be the performance limitation due to the slow host processor.
We
ran some tests on the commercially available cards using IOMETER and we
found that the performance is limited by the host processor speed. The
55MBytes/Sec throughput was observed when the Agilent HBA (bought
commercially not manufactured by us) was tested using 266 MMX Pentium
processor and IOMETER. We also understand that the above said chip needs
processor intervention to tackle some of the protocol specific issues. How
far this wil slow down the data thru put? What would be the impact if we
are
using the 166 MMX processor? Anybody done any benchmarking?----- Original Message -----
From: “Steve Gonczi”
> To: “NT Developers Interest List”
> Sent: Friday, February 09, 2001 7:41 AM
> Subject: [ntdev] Re: Please clarify these doubts about NDIS drivers
>
>
> >
> > >1. Would you like to tell me what the maximum performance based on the
> > above
> > >system?
> > > Is 100MB/s achievable?
> >
> > Doing what?
> >
> > You probably mean 100 Mb (Megabits). You can easily saturate a 100Mb
line
> > pushing large packets. Modern 10/100 NIC-s and drivers are capable of
> > sending/receiving 20K to 120K packets per second. (depending on NIC, OS
> and
> > driver). It takes about 8300 full-size Ethernet packets to saturate
> > one line, one way (remember, it is full duplex).
> >
> > When your traffic consists of a large number of small packets, the
> > NIC/driver
> > overhead and context switches come increasingly into play.
> >
> > If you tell us more about what you have in mind, I would be glad to
> > go into more detail.
> >
> > /sG
> >
> >
> >
> > —
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