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- Path: sparky!uunet!olivea!spool.mu.edu!agate!ames!biersch!aga
- From: aga@Comtech.com (Alan G. Arndt)
- Newsgroups: comp.protocols.nfs
- Subject: Re: Sun PC-NFS performance (again)
- Message-ID: <1992Dec15.180729.22750@Comtech.com>
- Date: 15 Dec 92 18:07:29 GMT
- References: <1992Dec7.173718.12792@Comtech.com> <1g3673INNa64@seven-up.East.Sun.COM> <1992Dec15.015951.20329@Comtech.com>
- Organization: Comtech Labs Inc, Palo Alto
- Lines: 37
-
-
- Well last night I reread the ENTIRE PC-NFS manual set, for various
- reasons, but the main thing I came across was the /i0 option. To
- copy a recent add, here are some readings from the PC-NFS manauls:
-
- V3.5
- /i0 Disable incoming Internet Datagram fragment reassembly. This saves
- about 4kb os memory. Unless you are working across an Internet
- router such as Sunlink-INRtm, this will not cause problems -
- PC-NFS never requests more data than will fit in a single Ethernet
- packet. Do NOT disable if you are using a serial port connection.
-
- V4.0
- /i0 This option disables the reassembly of incoming Internet Protocol (IP)
- datagram fragments. This option will save about 4Kbytes of memory,
- but use it with great caution. Never use this option if your network is
- gatewayed to remote networks, or if you are using Serial Line Internet
- Protocol (SLIP). (Note that "0" is a number, not a letter.)
-
- Long ago when I put /i0 on my pcnfs.sys I did so to save 4KB of precious
- memory and I wasn't gatewayed or using SLIP. Long ago I also remember
- PC-NFS using FULL 8Kbyte requests and the new TSize option says it will
- use 8Kbyte writes. Well it does neither. Reads are 1K and writes are
- 512 bytes. I began to think that the /i0 option also applied to local
- connections now as I was not getting anything larger then a 1k packet
- without another request. Well that is NOT the case and as the 3.5
- manaul says PC-NFS will not request more than a single ethernet packet
- can hold. WHY?!?!?!!? I understand that many adaptors can't deal with
- it. I do also belive that long ago it DID allow 8KByte requests. AND
- the TSize option implies that it will use larger packets on writes.
-
- Now that I KNOW exactly WHY PC-NFS is so slow what can be done to change it?
-
- ----
- Alan Arndt Comtech Labs
- 415-813-4500 4005 Miranda Avenue, Suite 150
- aga@Comtech.com Palo Alto, CA 94304-1218
-