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 PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Sun, 28 Sep 2014 17:37:59 -0400 (EDT) From: David Miller <davem@...emloft.net> To: eric.dumazet@...il.com Cc: netdev@...r.kernel.org, amirv@...lanox.com, john.r.fastabend@...el.com, brouer@...hat.com Subject: Re: [PATCH net-next] net: reorganize sk_buff for faster __copy_skb_header() From: Eric Dumazet <eric.dumazet@...il.com> Date: Thu, 25 Sep 2014 14:20:04 -0700 > From: Eric Dumazet <edumazet@...gle.com> > > With proliferation of bit fields in sk_buff, __copy_skb_header() became > quite expensive, showing as the most expensive function in a GSO > workload. > > __copy_skb_header() performance is also critical for non GSO TCP > operations, as it is used from skb_clone() > > This patch carefully moves all the fields that were not copied in a > separate zone : cloned, nohdr, fclone, peeked, head_frag, xmit_more > > Then I moved all other fields and all other copied fields in a section > delimited by headers_start[0]/headers_end[0] section so that we > can use a single memcpy() call, inlined by compiler using long > word load/stores. > > I also tried to make all copies in the natural orders of sk_buff, > to help hardware prefetching. > > I made sure sk_buff size did not change. > > Signed-off-by: Eric Dumazet <edumazet@...gle.com> Applied, thanks! -- 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