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, 08 Jun 2011 23:31:45 -0700 (PDT) From: David Miller <davem@...emloft.net> To: eric.dumazet@...il.com Cc: netdev@...r.kernel.org, andi@...stfloor.org, tim.c.chen@...ux.intel.com Subject: Re: [PATCH net-next-2.6] inetpeer: lower false sharing effect From: Eric Dumazet <eric.dumazet@...il.com> Date: Thu, 09 Jun 2011 08:26:50 +0200 > Profiles show false sharing in addr_compare() because refcnt/dtime > changes dirty the first inet_peer cache line, where are lying the keys > used at lookup time. If many cpus are calling inet_getpeer() and > inet_putpeer(), or need frag ids, addr_compare() is in 2nd position in > "perf top". > > Before patch, my udpflood bench (16 threads) on my 2x4x2 machine : .. > After patch, no more addr_compare() in profiles : .. > Signed-off-by: Eric Dumazet <eric.dumazet@...il.com> > CC: Andi Kleen <andi@...stfloor.org> > CC: Tim Chen <tim.c.chen@...ux.intel.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