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 01:44:27 +0200 From: Hannes Frederic Sowa <hannes@...essinduktion.org> To: Eric Dumazet <eric.dumazet@...il.com>, Or Gerlitz <gerlitz.or@...il.com> Cc: Alexei Starovoitov <ast@...mgrid.com>, "David S. Miller" <davem@...emloft.net>, Jesper Dangaard Brouer <brouer@...hat.com>, Eric Dumazet <edumazet@...gle.com>, John Fastabend <john.r.fastabend@...el.com>, Linux Netdev List <netdev@...r.kernel.org>, Amir Vadai <amirv@...lanox.com>, Or Gerlitz <or.gerlitz@...il.com> Subject: Re: [PATCH net-next] mlx4: optimize xmit path Hi Eric, On Sun, Sep 28, 2014, at 00:56, Eric Dumazet wrote: > - ring->cons += txbbs_skipped; > + > + /* we want to dirty this cache line once */ > + ACCESS_ONCE(ring->last_nr_txbb) = last_nr_txbb; > + ACCESS_ONCE(ring->cons) = ring_cons + txbbs_skipped; > + Impressive work! I wonder if another macro might be useful for those kind of dereferences, because ACCESS_ONCE is associated with correctness in my mind and those usages only try to optimize access patterns. Does OPTIMIZER_HIDE_VAR generate the same code? Bye, Hannes -- 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