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Date: Thu, 16 Apr 2015 12:20:06 +0800 From: Herbert Xu <herbert@...dor.apana.org.au> To: Eric Dumazet <eric.dumazet@...il.com> Cc: stefano.stabellini@...citrix.com, george.dunlap@...citrix.com, Jonathan.Davies@...rix.com, xen-devel@...ts.xensource.com, wei.liu2@...rix.com, Ian.Campbell@...rix.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, edumazet@...gle.com, paul.durrant@...rix.com, christoffer.dall@...aro.org, felipe.franciosi@...rix.com, linux-arm-kernel@...ts.infradead.org, david.vrabel@...rix.com Subject: Re: [Xen-devel] "tcp: refine TSO autosizing" causes performance regression on Xen Eric Dumazet <eric.dumazet@...il.com> wrote: > > We already have netdev->gso_max_size and netdev->gso_max_segs > which are cached into sk->sk_gso_max_size & sk->sk_gso_max_segs It is quite dangerous to attempt tricks like this because a tc redirection or netfilter nat could change the destination device rendering such hints incorrect. Cheers, -- Email: Herbert Xu <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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