linux-kernel - Re: [PATCH v2] tcp: splice as many packets as possible at once

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20090204080851.GA10445@ioremap.net>
Date:	Wed, 4 Feb 2009 11:08:51 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	David Miller <davem@...emloft.net>
Cc:	jarkao2@...il.com, herbert@...dor.apana.org.au, w@....eu,
	dada1@...mosbay.com, ben@...s.com, mingo@...e.hu,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jens.axboe@...cle.com
Subject: Re: [PATCH v2] tcp: splice as many packets as possible at once

On Tue, Feb 03, 2009 at 04:46:09PM -0800, David Miller (davem@...emloft.net) wrote:
> > NTA tried to solve this by not allowing to free the data allocated on
> > the different CPU, contrary to what SLAB does. Modulo cache coherency
> > improvements,
> 
> This could kill performance on NUMA systems if we are not careful.
> 
> If we ever consider NTA seriously, these issues would need to
> be performance tested.

Quite contrary I think. Memory is allocated and freed on the same CPU,
which means on the same memory domain, closest to the CPU in question.

I did not test NUMA though, but NTA performance on the usual CPU (it is
2.5 years old already :) was noticebly good.

-- 
	Evgeniy Polyakov
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/