| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 15 Feb 2012 09:49:07 -0500 From: Neal Cardwell <ncardwell@...gle.com> To: alekcejk@...glemail.com Cc: Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org Subject: Re: Re: Re: Re: Re: Re: Re: Re: limited network bandwidth with 3.2.x kernels If there was an increase in the number of bytes charged to the socket for each skb, without a corresponding increase in TCP receive buffer size, that would explain a systematic decrease in receiver window that would cause some paths, like perhaps these, to become receiver-window-limited (which is consistent with the symptom of stable bandwidth for a given path). Can you please try increasing the default TCP receiver window to see if this helps; try this as root on the 3.2 machine: sysctl net.ipv4.tcp_rmem="4096 897664 897664" Basically making the middle number as big as the third number should bump up the default receiver window size. neal -- 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
Powered by blists - more mailing lists