Hello Dave -
On Thu, 15 Jun 2000, Dave Kitabjian wrote:
> I might have better luck on a Unix newsgroup, but I'll proceed anyway...
>
> Regarding the SocketQueueLength global, does this pertain to the same
> setting as the kern.ipc.somaxconn MIB variable? On my system, I get:
>
> # sysctl kern.ipc.somaxconn
> kern.ipc.somaxconn: 128
>
> According to "man listen":
>
> "...The backlog parameter defines the maximum length the queue of
> pending
> connections may grow to. If a connection request arrives with the queue
> full the client may receive an error with an indication of ECONNREFUSED,
> or, if the underlying protocol supports retransmission, the request may
> be ignored so that retries may succeed.
>
> The sysctl(3) MIB variable ``kern.ipc.somaxconn'' specifies a hard limit
> on backlog; if a value greater than kern.ipc.somaxconn or less than
> zero
> is specified, backlog is silently forced to kern.ipc.somaxconn...."
>
> So are these apples and apples, or are they two unrelated quantities?
>
> Also, what are the units on SocketQueueLength: bytes or requests?
>
Yes, these are the same thing. You need to configure the kernel before you can
tell Radiator to use the extra queue space. The units are bytes, as the packets
can be different lengths.
Just as a matter of interest, it is unlikely that adding queue length is going
to help an overloaded machine. You are usually better off adding redundant
Radiator hosts and configuring your NAS equipment to try a secondary server if
there is no response. Or alternatively you can add a packet redirector in front
of the Radiator hosts to distribute the load.
hth
Hugh
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