Subject: Re: low performance on intel fxp driver
To: Andrew Gillham <email@example.com>
From: Rogier Krieger <firstname.lastname@example.org>
Date: 06/10/2001 22:49:37
thanks for your quick reply. Sunday is a great day for testing, so here goes.
Previous Correspondence from Andrew Gillham (11:23 10-6-01 -0700):
>Can you locate 'netio' (version 1.14) and test with it between the two
>machines? It tests a TCP connection with various "block" sizes so it is
>perhaps simpler to test with than ttcp.
The pkgsrc/benchmark directory was most helpful in locating netio.
I ran a test right away. It did give rather promising results.
Here's the output of Win95b client -> NetBSD server
Packet size 1 KByte: 9632 KByte/s
Packet size 2 KByte: 10894 KByte/s
Packet size 4 KByte: 11089 KByte/s
Packet size 8 KByte: 10963 KByte/s
Packet size 16 KByte: 248 KByte/s
Packet size 32 KByte: 401 KByte/s
The last two lines, even after prolonged testing, remain fairly constant.
Rather worrying low speeds, or am is it just me. I think not.
Here's the output of NetBSD client -> Win95b server
TCP/IP connection established.
Packet size 1 KByte: 10199 KByte/s
Packet size 2 KByte: 10455 KByte/s
Packet size 4 KByte: 10923 KByte/s
Packet size 8 KByte: 10756 KByte/s
Packet size 16 KByte: 10918 KByte/s
Packet size 32 KByte: send(): Inappropriate ioctl for device 9686 KByte/s
For the last line, I the message buffer for the error. Here's the dmesg entry
WARNING: mclpool limit reached; increase NMBCLUSTERS
Nothing that can't be fixed, I suppose. Would it be an explanation for
the low speeds I experienced earlier? I must point out, that this is the
first time I saw the NMBClusters warning message.
>Try to ftp your file to /dev/null or "nul:" to eliminate disk i/o as the
>issue. Obviously it was working with the rtk cards, but perhaps there
>is an interaction between fxp and disk i/o, or your filesystems are more
>fragmented on either end, etc.
Here I get back to a maximum of only 4000KByte/s for downloading
from the NetBSD server and a rather low maximum of 2900KByte/s
for an upload to the NetBSD server. The latter could of course be
the result of fragmentation, although Windows tells me I suffer from
only 0%-2% fragmentation on any drive I tested.
>With netio I see about 11Mbyte/s between them.
This makes me wonder whether I can adjust the packet size to the
8Kbyte/s where speeds seem to run around their optimum. Or is
this a dumb question?
>Jason Thorpe has worked on the fxp driver in -current, you might test boot
>a -current kernel and see how that works.
Will that also require a re-install or can I use the syssrc collection for
to bake a kernel that can peacefully co-exist with my present one? The NetBSD
machine has the prime tasks of running my ftp/web/ssh/samba servers and
to provide my presumed insecure windows machine NAT'ed access to the net.
Any insight appreciated,