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Date: Thu, 22 Nov 2007 17:27:29 +0800 From: Herbert Xu <herbert@...dor.apana.org.au> To: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi> Cc: John Heffner <jheffner@....edu>, netdev@...r.kernel.org Subject: Re: [RFC PATCH 1/2] [TCP]: MTUprobe: receiver window & data available checks fixed On Wed, Nov 21, 2007 at 06:01:27PM +0200, Ilpo Järvinen wrote: > > Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi> Thanks for the patch Ilpo! I've just got a couple small questions. > @@ -1307,6 +1308,7 @@ static int tcp_mtu_probe(struct sock *sk) > /* Very simple search strategy: just double the MSS. */ > mss_now = tcp_current_mss(sk, 0); > probe_size = 2*tp->mss_cache; > + size_needed = probe_size + (tp->reordering + 1) * mss_now; Should we use mss_now here or mss_cache? It would seem that an over-estimate would be safer than an under-estimate. Also should that be Tcprexmtthresh segments at the current MTU or the probed MTU? Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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