Thanks! That's very helpful to show this customer... appreciate you passing that on!
Scott Rohling On Mon, Sep 29, 2008 at 10:51 AM, Hall, Ken (GTS) <[EMAIL PROTECTED]> wrote: > We actually opened an issue with IBM over this. Here's what I got back: > > > Action Taken...: The ethtool utility is not supported with all device > drivers as noted in the man page. It's very typical that for an > gigabit NIC (especially a fiber connection) will not have a valid > speed reported or no speed reported at all. To some degree it makes a > bit of sense as a gigabit card is exactly that, 1GB. That is you can't > tell a 1GB FIBER card to run at 10MB. Granted what gets reported by > ethtool (really what th device driver is returning is mis-leading). > > Here is another example .. a very simple Tigon3 GB NIC, note the > speed it reported as Unknown! > > > [EMAIL PROTECTED] ~]# ethtool eth0 > Settings for eth0: > Supported ports: [ FIBRE ] > Supported link modes: 1000baseT/Half 1000baseT/Full > Supports auto-negotiation: Yes > Advertised link modes: 1000baseT/Half 1000baseT/Full > Advertised auto-negotiation: Yes > Speed: Unknown! (0) > Duplex: Half > Port: FIBRE > > > mii-tool is only valid for mii compatable NIC cards. > > If the goal is to do some performance testing, then the best method > is to use the netperf tools. ( see http://www.netperf.org) Another > simple test is using dd and ftp, for example: > > # ftp <hostname_of_server> > ftp> bin > ftp> put "| dd if=/dev/zero bs=32k count=10000" /dev/null > > Using either of these tools should confirm that the NICS are > transfering far faster the 10MB. > > > So in other words, the gigabit OSA can only run at a gigabit, the tools > are useless for this application, and the only way to be sure about the > throughput is to measure it. > > > -----Original Message----- > From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of > Mark Post > Sent: Monday, September 29, 2008 12:14 PM > To: LINUX-390@VM.MARIST.EDU > Subject: Re: [LINUX-390] Gigabit interface on Linux? > > >>> On 9/29/2008 at 12:02 PM, in message > <[EMAIL PROTECTED]>, Scott > Rohling > <[EMAIL PROTECTED]> wrote: > > On RHEL5.2 -- we're using mii-tools and seeing that the ethernet > interface > > is set to 100mbs -- the OSA is set to gigabit - and we're wondering > if > > something special needs to be done to set it to gigabit speeds.. > Using > > 'ethtool=' doesn't seem to work on Linux (s390x linux).. > > I'm amazed that mii-tools returns anything at all. > > > This is on a VSWITCH -- everything works fine except the reported > speed... > > Any ideas? > > Since the interface that mii-tools is reporting on is a virtual one, > having nothing to do with any real hardware, I would say ignore it. > > > Mark Post > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or > visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > -------------------------------------------------------- > > This message w/attachments (message) may be privileged, confidential or > proprietary, and if you are not an intended recipient, please notify the > sender, do not use or share it and delete it. Unless specifically indicated, > this message is not an offer to sell or a solicitation of any investment > products or other financial product or service, an official confirmation of > any transaction, or an official statement of Merrill Lynch. Subject to > applicable law, Merrill Lynch may monitor, review and retain > e-communications (EC) traveling through its networks/systems. The laws of > the country of each sender/recipient may impact the handling of EC, and EC > may be archived, supervised and produced in countries other than the country > in which you are located. This message cannot be guaranteed to be secure or > error-free. This message is subject to terms available at the following > link: http://www.ml.com/e-communications_terms/. By messaging with Merrill > Lynch you consent to the foregoing. > -------------------------------------------------------- > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or > visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
