From: Stephen Hemminger <shemminger@vyatta.com>
To: Stephen Hemminger <shemminger@vyatta.com>
Cc: David Miller <davem@davemloft.net>, netdev@vger.kernel.org
Subject: Re: [PATCH 6/7] sky2: no recycling
Date: Wed, 19 Aug 2009 12:58:25 -0700 [thread overview]
Message-ID: <20090819125825.0cf27e0e@s6510> (raw)
In-Reply-To: <20090819011738.993523293@vyatta.com>
On Tue, 18 Aug 2009 18:17:10 -0700
Stephen Hemminger <shemminger@vyatta.com> wrote:
> Recycling turns out to be a bad idea! For most use cases, the
> packet can not be reused: TCP packets are cloned. Even for the ideal
> case of forwarding, it hurts performance because of CPU ping/pong.
> On a multi-core system forwarding of 64 byte packets is worse
> much worse: recycling = 24% forwarded vs no recycling = 42% forwarded
Minor correction on numbers. The actual data for unidirectional
forwarding is 30% vs 24%. Previous data had hardware flow/control enabled
which skewed the numbers.
next prev parent reply other threads:[~2009-08-19 19:58 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-19 1:17 [PATCH 0/7] sky2: tx performance improvement Stephen Hemminger
2009-08-19 1:17 ` [PATCH 1/7] sky2: use upper/lower 32 bits Stephen Hemminger
2009-08-19 1:17 ` [PATCH 2/7] sky2: transmit ring 64 bit conservation Stephen Hemminger
2009-08-19 1:17 ` [PATCH 3/7] sky2: simplify list element error Stephen Hemminger
2009-08-19 1:17 ` [PATCH 4/7] sky2: dynamic size transmit ring Stephen Hemminger
2009-08-19 1:17 ` [PATCH 5/7] sky2: optimize transmit completion Stephen Hemminger
2009-08-19 1:17 ` [PATCH 6/7] sky2: no recycling Stephen Hemminger
2009-08-19 19:58 ` Stephen Hemminger [this message]
2009-08-19 1:17 ` [PATCH 7/7] sky2: version 1.25 Stephen Hemminger
2009-08-19 3:28 ` [PATCH 0/7] sky2: tx performance improvement David Miller
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