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Date: Wed, 14 May 2014 21:25:12 +0200 From: Jesper Dangaard Brouer <brouer@...hat.com> To: David Laight <David.Laight@...LAB.COM> Cc: brouer@...hat.com, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, Alexander Duyck <alexander.h.duyck@...el.com>, Jeff Kirsher <jeffrey.t.kirsher@...el.com>, Daniel Borkmann <dborkman@...hat.com>, "Florian Westphal" <fw@...len.de>, "David S. Miller" <davem@...emloft.net>, "Stephen Hemminger" <shemminger@...tta.com>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Robert Olsson <robert@...julf.se>, Ben Greear <greearb@...delatech.com>, John Fastabend <john.r.fastabend@...el.com>, "danieltt@....se" <danieltt@....se>, "zhouzhouyi@...il.com" <zhouzhouyi@...il.com> Subject: Re: [net-next PATCH 2/5] ixgbe: increase default TX ring buffer to 1024 On Wed, 14 May 2014 14:28:24 +0000 David Laight <David.Laight@...LAB.COM> wrote: > From: Jesper Dangaard Brouer > > Using pktgen I'm seeing the ixgbe driver "push-back", due TX ring > > running full. Thus, the TX ring is artificially limiting pktgen. > > > > Diagnose via "ethtool -S", look for "tx_restart_queue" or "tx_busy" > > counters. > > Have you tried reducing the tx interrupt mitigation delay. > It might just be that the end of tx interrupt is delayed too long. Does the ixgbe have TX interrupt mitigation delays? I don't "see" them: $ sudo ethtool -c eth8 Coalesce parameters for eth8: Adaptive RX: off TX: off stats-block-usecs: 0 sample-interval: 0 pkt-rate-low: 0 pkt-rate-high: 0 rx-usecs: 1 rx-frames: 0 rx-usecs-irq: 0 rx-frames-irq: 0 tx-usecs: 0 tx-frames: 0 tx-usecs-irq: 0 tx-frames-irq: 0 rx-usecs-low: 0 rx-frame-low: 0 tx-usecs-low: 0 tx-frame-low: 0 rx-usecs-high: 0 rx-frame-high: 0 tx-usecs-high: 0 tx-frame-high: 0 -- Best regards, Jesper Dangaard Brouer MSc.CS, Sr. Network Kernel Developer at Red Hat Author of http://www.iptv-analyzer.org LinkedIn: http://www.linkedin.com/in/brouer -- 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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