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Re: File System Performance Loss in Genera 8.0 (16X slower!)
Date: Mon, 9 Jul 90 11:08 EDT
From: email@example.com (Barry Margolin)
In Genera 8.0, IP is able to reassemble datagrams of arbitrary size. By
default it requests 4K bytes of data when reading files from a server on
the local net (it still defaults to .5K for remote networks, presumably
because the likelihood of losing a packet is higher). On an ethernet
this will be fragmented into at least three packets.
Did something different happen in 7.2 (where we never
had this problem)? Does anybody have a cure for this?
Try setting NFS:*LOCAL-NETWORK-TRANSFER-SIZE* back down to 1024.
This is close but not totally correct.
Symbolics NFS uses NFS:*LOCAL-SUBNET-TRANSFER-SIZE* when talking NFS over the
local ethernet (the same internet subnet), NFS:*LOCAL-NETWORK-TRANSFER-SIZE*
when talking through a gateway, but still on the same internet network, and
NFS:*DEFAULT-TRANSFER-SIZE* if the other host is on another internet network.
The defaults for these three variables are:
If you are having problems talking to a sun, and the sun is on the same
ethernet as your Symbolics computer, then first try adjusting
NFS:*LOCAL-SUBNET-TRANSFER-SIZE* to 4096, and see if you get better
throughput. If that fails, then I suggest adjusting
NFS:*LOCAL-SUBNET-TRANSFER-SIZE* and NFS:*LOCAL-NETWORK-TRANSFER-SIZE* to