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Date: Fri, 07 Mar 2008 12:55:31 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Neil Brown <neilb@...e.de> Cc: Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, netdev@...r.kernel.org, trond.myklebust@....uio.no, Pekka Enberg <penberg@...helsinki.fi> Subject: Re: [PATCH 00/28] Swap over NFS -v16 On Fri, 2008-03-07 at 12:17 +0100, Peter Zijlstra wrote: > That would be so if the whole path from RX to socket demux would have > hard-irqs disabled. However I didn't see that. Moreover I think the > whole purpose of the NetPoll interface is to allow some RX queueing to > cut down on softirq overhead. s/NetPoll/NAPI/ More specifically look at net/core/dev.c:netif_rx() It has a input queue per device. > > 2/ If the host is routing network packets, then incoming packets > > might go on an outbound queue. Is this space limited? and > > included in the reserve? > > Not sure, somewhere along the routing code I lost it again. Constructive > input from someone versed in that part of the kernel would be most > welcome. To clarify, I think we just send it on as I saw no reason why that could fail. However the more fancy stuff like engress or QoS might spoil the party, that is where I lost track. -- 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
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