Re: NetBSD 5.1 TCP performance issue (lots of ACK)

To: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
Subject: Re: NetBSD 5.1 TCP performance issue (lots of ACK)
From: Martin Husemann <martin%duskware.de@localhost>
Date: Sat, 29 Oct 2011 22:14:18 +0200

On Sat, Oct 29, 2011 at 10:02:10PM +0200, Manuel Bouyer wrote:
> OK, I see. But, is there a platoform where BUS_DMASYNC_PREREAD is not
> a NOP ? I can't what kind of work BUS_DMASYNC_PREREAD could have to do ...

On platforms with memory reordering it might be a barrier (i.e. sparc64 does
a membar_sync() for it).

Martin

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References:
- Re: NetBSD 5.1 TCP performance issue (lots of ACK)
  - From: Greg Troxel
- Re: NetBSD 5.1 TCP performance issue (lots of ACK)
  - From: Manuel Bouyer
- Re: NetBSD 5.1 TCP performance issue (lots of ACK)
  - From: Manuel Bouyer
- Re: NetBSD 5.1 TCP performance issue (lots of ACK)
  - From: Thor Lancelot Simon
- Re: NetBSD 5.1 TCP performance issue (lots of ACK)
  - From: Manuel Bouyer
- Re: NetBSD 5.1 TCP performance issue (lots of ACK)
  - From: Manuel Bouyer
- Re: NetBSD 5.1 TCP performance issue (lots of ACK)
  - From: David Young
- Re: NetBSD 5.1 TCP performance issue (lots of ACK)
  - From: Manuel Bouyer
- Re: NetBSD 5.1 TCP performance issue (lots of ACK)
  - From: David Young
- Re: NetBSD 5.1 TCP performance issue (lots of ACK)
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