Re: [Iometer-user] IOmeter on Linux iSCSI.

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if over iscsi, one read stream and one write stream, it is possible. ;)

ming

On Sun, 2006-09-17 at 17:51 -0700, Ian wrote:
> Haha, sorry... that's what I get for not reading the entire thread...
> I thought this was a network test.  :)
> 
> Ming Zhang wrote: 
> > he referenced that email so i thought he meant real disk io? if he do
> > ram disk io and that 2Gbps is possible with some awesome HW.
> > 
> > Ming
> > 
> > On Sat, 2006-09-16 at 18:52 -0700, Ian wrote:
> >   
> > > Wouldn't 2000MBps be possible if the 1Gbps network was full duplex?
> > > (Barring protocol overhead)
> > > 
> > > Ming Zhang wrote: 
> > >     
> > > > check out rc3 version and try again.
> > > > 
> > > > ps, cc to iometer list always.
> > > > 
> > > > ming
> > > > 
> > > > On Sat, 2006-09-16 at 16:18 -0700, Gururaj Ananthateerta wrote:
> > > >   
> > > >       
> > > > > Ming,
> > > > > I am getting into the following suituation. What is the remedy?
> > > > > 
> > > > >  
> > > > > Re: iometer reports throughput of 2000MBps on a 1Gbps network Click to
> > > > > flag this post 
> > > > > by  Ming Zhang  2006-05-09 11:40 |  Reply | 
> > > > > PM
> > > > > | View this Message in the Context of Discussion | Rate this Message:
> > > > > Click to rate as Poor PostClick to rate as Below Average PostClick to
> > > > > rate as Average PostClick to rate as Above Average PostClick to rate
> > > > > as Excellent Post Click to clear rating (use ratings to moderate[?]) 
> > > > > 
> > > > > Hi All 
> > > > > 
> > > > > I already checked in a fix for this. If dynamo failed to detect the 
> > > > > device size, it will print a message about this and exclude it from 
> > > > > test. So less chance to get a zero size device and weired throughout. 
> > > > > Also those misleading "fail to detect by..." msg are hidden now.
> > > > > Please 
> > > > > check out latest svn code to verify. 
> > > > > 
> > > > > @Bing, thanks for your finding. 
> > > > > 
> > > > > Ming 
> > > > > 
> > > > > 
> > > > > On Thu, 2006-05-04 at 13:10 -0400, Ming Zhang wrote: 
> > > > >     
> > > > >         
> > > > > > On Thu, 2006-05-04 at 09:47 -0700, Bing R. Tsai wrote: 
> > > > > >       
> > > > > >           
> > > > > > > I saw the same when running the Linux version to a 
> > > > > > > raw disk on an iSCSI target. By looking at the packet 
> > > > > > > traces, I found that IOmeter did not advance/change 
> > > > > > > the 
> > > > > > > read/write offset at all hence the high throughput. 
> > > > > > > 
> > > > > > > In my case, the root cause was that the dynamo 
> > > > > > > engine failed to detect the correct size of the 
> > > > > > > /dev/sd* device upon failing the ioctl() call, 
> > > > > > > and assumed the device to be of size zero. 
> > > > > > >         
> > > > > > >             
> > > > > > if this is the case, then i should add a size check and refuse to
> > > > > >       
> > > > > >           
> > > > > go 
> > > > >     
> > > > >         
> > > > > > ahead if one disk size is 0. 
> > > > > > 
> > > > > > also could u try the latest code from 
> > > > > > 
> > > > > >       
> > > > > >           
> > > > > svn://svn.berlios.de/svnroot/repos/iometer/branches/IOMETER-restruct/iometer 
> > > > >     
> > > > >         
> > > > > > that code has this ioctl detect fixed. 
> > > > > > 
> > > > > > ming 
> > > > > > 
> > > > > >       
> > > > > >           
> > > > > > > --- Pratap Devatha <pratapd@...> wrote: 
> > > > > > > 
> > > > > > >         
> > > > > > >             
> > > > > > > > Hi Ming and others, 
> > > > > > > >     
> > > > > > > >   I am running iometer on a 1Gbps network. I am 
> > > > > > > > getting throuhghput of more than 2000MBps (Mega 
> > > > > > > > Bytes per second). The test is being run on a raw 
> > > > > > > > physical disk. 
> > > > > > > >     
> > > > > > > >   iostat does not report any reads or writes on the 
> > > > > > > > device. The network interface also done not show any 
> > > > > > > > activity. 
> > > > > > > >     
> > > > > > > >   Please let me know why the iometer is reporting 
> > > > > > > > throughput of more than the line speed. 
> > > > > > > >     
> > > > > > > >   thanks in advance 
> > > > > > > >   Pratap 
> > > > > > > >     
> > > > > > > >     
> > > > > > > > 
> > > > > > > > 
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