netdev - Re: >10% performance degradation since 2.6.18

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

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090705040137.GA7747@gondor.apana.org.au>
Date:	Sun, 5 Jul 2009 12:01:37 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	andi@...stfloor.org, arjan@...radead.org, matthew@....cx,
	jens.axboe@...cle.com, linux-kernel@...r.kernel.org,
	douglas.w.styner@...el.com, chinang.ma@...el.com,
	terry.o.prickett@...el.com, matthew.r.wilcox@...el.com,
	Eric.Moore@....com, DL-MPTFusionLinux@....com,
	netdev@...r.kernel.org
Subject: Re: >10% performance degradation since 2.6.18

Jeff Garzik <jeff@...zik.org> wrote:
> 
> What's the best setup for power usage?
> What's the best setup for performance?
> Are they the same?

Yes.

> Is it most optimal to have the interrupt for socket $X occur on the same 
> CPU as where the app is running?

Yes.

> If yes, how to best handle when the scheduler moves app to another CPU?
> Should we reprogram the NIC hardware flow steering mechanism at that point?

Not really.  For now the best thing to do is to pin everything
down and not move at all, because we can't afford to move.

The only way for moving to work is if we had the ability to get
the sockets to follow the processes.  That means, we must have
one RX queue per socket.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
--
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