Date: Mon, 15 Nov 2010 18:03:25 -0800 From: Pyun YongHyeon <pyunyh@gmail.com> To: uqs@spoerlein.net Cc: stable@freebsd.org Subject: Re: Abysmal re(4) performance under 8.1-STABLE (mid-August) Message-ID: <20101116020325.GI1257@michelle.cdnetworks.com> In-Reply-To: <20101114094103.GA64243@acme.spoerlein.net> References: <20101106093700.GW85693@acme.spoerlein.net> <AANLkTinqcv0M_CR9uHWtjOeHNHt4QGjhS_wNNOjJinu_@mail.gmail.com> <20101107112421.GH85693@acme.spoerlein.net> <20101107231020.GB1279@michelle.cdnetworks.com> <20101108214112.GY85693@acme.spoerlein.net> <20101114094103.GA64243@acme.spoerlein.net>
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On Sun, Nov 14, 2010 at 10:41:03AM +0100, Ulrich Sp??rlein wrote: > On Mon, 08.11.2010 at 22:41:12 +0100, Ulrich Sp??rlein wrote: > > On Sun, 07.11.2010 at 15:10:20 -0800, Pyun YongHyeon wrote: > > > On Sun, Nov 07, 2010 at 12:24:21PM +0100, Ulrich Sp??rlein wrote: > > > > On Sat, 06.11.2010 at 23:19:33 -0700, Pyun YongHyeon wrote: > > > > > On Sat, Nov 6, 2010 at 2:37 AM, Ulrich Sp??rlein <uqs@spoerlein.net> wrote: > > > > > > Hello Pyun, > > > > > > > > > > > > On this new server, I cannot get more than ~280kByte/s up/downstream out of > > > > > > re(4) without any tweaking. > > > > > > > > > > > > re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 > > > > > > ?? ?? ?? ??options=389b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_UCAST,WOL_MCAST,WOL_MAGIC> > > > > > > ?? ?? ?? ??ether 00:21:85:63:74:34 > > > > > > ?? ?? ?? ??inet6 fe80::221:85ff:fe63:7434%re0 prefixlen 64 scopeid 0x1 > > > > > > ?? ?? ?? ??inet 46.4.12.147 netmask 0xffffffc0 broadcast 46.4.12.191 > > > > > > ?? ?? ?? ??nd6 options=3<PERFORMNUD,ACCEPT_RTADV> > > > > > > ?? ?? ?? ??media: Ethernet autoselect (100baseTX <half-duplex>) > > > > > > ?? ?? ?? ??status: active > > > > > > > > > > > > > > > > It seems the link was resolved to half-duplex. Does link partner > > > > > also agree on the resolved speed/duplex? > > > > > > > > As this is a dedicated server in a colo hundreds of km away, I have no > > > > means to check this easily. Especially I cannot change the setting from > > > > auto-neg. Btw, linux will show a negotiated 100/full link via mii-tool. > > > > > > > > > > I guess you can contact network administrator of the data center to > > > check the switch configuration. IEEE 802.3 says if link parter use > > > forced full-duplex media and you use auto media, the resolved > > > duplex is half-duplex by definition. I think RealTek may have > > > followed the standard. There is no reason to use manual media > > > configuration unless your link partner is severely broken with > > > auto-negotiation. > > > > > > Due to silicon bug of RealTek PHYs, rgephy(4) always use > > > auto-negotiation so manual media configuration is a kind of > > > auto-negotiation with limited set of available media advertising. > > > I don't know how Linux solve the silicon bug though. One of magic > > > DSP fixups might fix the issue, the DSP fixups vendor released is > > > not under BSD license and does not say more detailed information > > > for the code. > > > > Luckily the provider switch me to another switch that is set to > > autoneg, instead of hardcoded to 100/full. re(4) now happily transfers > > with reasonable speeds, ie. 11MByte/s. > > Alas, spoken too soon. While the throughput is now up to speed, I have > severe problems with packet loss on this device. Again, the linux rescue > system works fine, but under a recent -STABLE (including your latest > MFCs) I get an average packet loss of 10-20%. But it is not constant, > meaning every 5th packet or so, but instead will drop no packets for > minutes-hours and then blackout for 1-5 min straight (these times are > estimates, I haven't used a stop watch or anything.) > > At first, putting the card into promisc mode seemed to alleviate the > issue, but the average ping packet loss during the last 10h was again up > to 10%. Due to the "blackout" nature, this drops all TCP sessions and is > really annoying. > > Do you have any other ideas that I could try? Or should I simply switch > to a different hardware altogether? > Could you try latest re(4) in HEAD? It has a new feature that displays hardware MAC counters and it contains a couple of PHY access enhancements. You would get the MAC counters on console with "sysctl dev.re.0.stats=1". And let me know how many frames were dropped.
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