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Message-ID: <1387388339.19078.321.camel@edumazet-glaptop2.roam.corp.google.com> Date: Wed, 18 Dec 2013 09:38:59 -0800 From: Eric Dumazet <eric.dumazet@...il.com> To: Hector Palacios <hector.palacios@...i.com> Cc: Marek Vasut <marex@...x.de>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "fabio.estevam@...escale.com" <fabio.estevam@...escale.com>, "shawn.guo@...aro.org" <shawn.guo@...aro.org>, l.stach@...gutronix.de, Frank Li <Frank.Li@...escale.com>, fugang.duan@...escale.com, bhutchings@...arflare.com, "davem@...emloft.net" <davem@...emloft.net> Subject: Re: FEC performance degradation with certain packet sizes On Wed, 2013-12-18 at 17:43 +0100, Hector Palacios wrote: > Hello, > > I'm resending this thread (reworded the subject) with additional people on CC. > I found the issue happens also with auto-negotiated link and is reproducible on the > i.MX6 as well as on the i.MX28. It looks like a problem with the fec driver. > > Steps to reproduce: > On the target: > netpipe > On the host: > netpipe -h <target_ip> -n 5 > > At certain packet sizes (starting always at 1533 bytes), the performance drops > dramatically: > > On i.MX28: > [...] > 42: 771 bytes 5 times --> 19.78 Mbps in 297.41 usec > 43: 1021 bytes 5 times --> 23.29 Mbps in 334.41 usec > 44: 1024 bytes 5 times --> 23.61 Mbps in 330.90 usec > 45: 1027 bytes 5 times --> 23.43 Mbps in 334.41 usec > 46: 1533 bytes 5 times --> 0.13 Mbps in 88817.49 usec > 47: 1536 bytes 5 times --> 0.06 Mbps in 189914.91 usec > 48: 1539 bytes 5 times --> 0.06 Mbps in 204917.19 usec > 49: 2045 bytes 5 times --> 0.07 Mbps in 210931.79 usec > 50: 2048 bytes 5 times --> 0.07 Mbps in 210919.10 usec > 51: 2051 bytes 5 times --> 0.07 Mbps in 212915.71 usec > 52: 3069 bytes 5 times --> 35.42 Mbps in 661.01 usec > 53: 3072 bytes 5 times --> 35.57 Mbps in 659.00 usec > 54: 3075 bytes 5 times --> 35.42 Mbps in 662.29 usec > 55: 4093 bytes 5 times --> 40.03 Mbps in 780.19 usec > 56: 4096 bytes 5 times --> 40.75 Mbps in 766.79 usec > 57: 4099 bytes 5 times --> 40.64 Mbps in 769.49 usec > 58: 6141 bytes 5 times --> 3.08 Mbps in 15187.90 usec > 59: 6144 bytes 5 times --> 2.94 Mbps in 15928.19 usec > 60: 6147 bytes 5 times --> 5.57 Mbps in 8418.91 usec > 61: 8189 bytes 5 times --> 1.34 Mbps in 46574.90 usec > 62: 8192 bytes 5 times --> 2.17 Mbps in 28781.99 usec > 63: 8195 bytes 5 times --> 1.36 Mbps in 45923.69 usec > 64: 12285 bytes 5 times --> 51.78 Mbps in 1810.21 usec > 65: 12288 bytes 5 times --> 50.46 Mbps in 1857.81 usec > 66: 12291 bytes 5 times --> 54.01 Mbps in 1736.21 usec > 67: 16381 bytes 5 times --> 55.86 Mbps in 2237.50 usec > 68: 16384 bytes 5 times --> 56.93 Mbps in 2195.79 usec > 69: 16387 bytes 5 times --> 35.62 Mbps in 3509.60 usec > 70: 24573 bytes 5 times --> 7.19 Mbps in 26075.60 usec > 71: 24576 bytes 5 times --> 58.36 Mbps in 3212.59 usec > 72: 24579 bytes 5 times --> 7.92 Mbps in 23678.90 usec > 73: 32765 bytes 5 times --> 58.14 Mbps in 4299.79 usec > 74: 32768 bytes 5 times --> 5.34 Mbps in 46810.20 usec > 75: 32771 bytes 5 times --> 41.51 Mbps in 6023.21 usec > 76: 49149 bytes 5 times --> 49.62 Mbps in 7557.20 usec > 77: 49152 bytes 5 times --> 48.82 Mbps in 7681.11 usec > > On i.MX6: > [...] > 42: 771 bytes 5 times --> 16.21 Mbps in 362.91 usec > 43: 1021 bytes 5 times --> 17.97 Mbps in 433.51 usec > 44: 1024 bytes 5 times --> 18.19 Mbps in 429.40 usec > 45: 1027 bytes 5 times --> 18.16 Mbps in 431.41 usec > 46: 1533 bytes 5 times --> 2.35 Mbps in 4970.11 usec > 47: 1536 bytes 5 times --> 2.36 Mbps in 4959.91 usec > 48: 1539 bytes 5 times --> 2.37 Mbps in 4959.20 usec > 49: 2045 bytes 5 times --> 3.14 Mbps in 4972.31 usec > 50: 2048 bytes 5 times --> 3.15 Mbps in 4959.50 usec > 51: 2051 bytes 5 times --> 3.15 Mbps in 4960.01 usec > 52: 3069 bytes 5 times --> 4.70 Mbps in 4984.19 usec > 53: 3072 bytes 5 times --> 4.73 Mbps in 4960.10 usec > 54: 3075 bytes 5 times --> 4.73 Mbps in 4957.81 usec > 55: 4093 bytes 5 times --> 6.29 Mbps in 4966.71 usec > 56: 4096 bytes 5 times --> 6.30 Mbps in 4962.00 usec > 57: 4099 bytes 5 times --> 6.31 Mbps in 4957.71 usec > 58: 6141 bytes 5 times --> 49.25 Mbps in 951.40 usec > 59: 6144 bytes 5 times --> 49.23 Mbps in 952.21 usec > 60: 6147 bytes 5 times --> 49.18 Mbps in 953.69 usec > > Does anyone have any clue about where the problem might be? What is the driver in use ? Have you tried disabling tso/gso ? ethtool -k eth0 ethtool -K eth0 tso off gso off -- 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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