On Tue, Sep 24, 2002 at 04:15:56PM -0700, Prafulla Deuskar wrote:
> Sorry for the cross-posting.
> ----------------------------
>
> All,
>
> Is there a pre-set limit on maximum number of fragments in a
> mbuf chain ?
>
> I see 64 fragments with jumboframes (mtu 9000) using nttcp.
aha... (this is related to the problem with the em driver and jumbo
frames, right ?)
o limit that i know of.
And now i clearly see how the long chain might arise -- sosend puts
each write in one ro more mbufs, then down in the call chain,
sbappend() is called which in turn calls sbcompress(). The problem
is, for short writes on a TCP socket (say 128 bytes at a time) the
data goes into regular mbufs, not clusters, so sbcompress does not
have a chance to compress the chain because of lack of space in the
mbufs.
A possible workaround would be to modify sbcompress to allocate
clusters replacing existing mbufs when such a situation exists.
cheers
luigi
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-net" in the body of the message
