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Message-ID: <1329286016.2555.41.camel@edumazet-laptop> Date: Wed, 15 Feb 2012 07:06:56 +0100 From: Eric Dumazet <eric.dumazet@...il.com> To: Neal Cardwell <ncardwell@...gle.com> Cc: alekcejk@...glemail.com, netdev@...r.kernel.org Subject: Re: Re: Re: Re: Re: Re: limited network bandwidth with 3.2.x kernels Le mercredi 15 février 2012 à 01:03 -0500, Neal Cardwell a écrit : > There are some potentially interesting differences in sysctl values: > > > diff -u /tmp/sysctl-a-3.1.txt /tmp/sysctl-a-3.2.txt | grep mem_def > -net.core.wmem_default = 114688 > -net.core.rmem_default = 114688 > +net.core.wmem_default = 163840 > +net.core.rmem_default = 163840 > > Can you please try running this as root on the 3.2 kernel and then see > what sort of performance you get: > > sysctl net.core.rmem_default=114688 > > This should make the 3.2 config closer to the 3.1 config. Should be > interesting to see if the behavior is more similar when that happens. > > neal These changes are normal, since skb truesize now include shared_info. By the way, these params are not used for tcp streams. This is why I asked netstat -s values, to check if we had drops because of truesize limits. Its not the case here since skb are not too fat (as some NICS can do, using a full PAGE to hold a single 1500 bytes frams) -- 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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