Re: [Scst-devel] Performance measurements/expectations

[Jack W. <xj...@gm...>]

Hi Paul,

You need to tuning the TCP/IP and iscsi parameters:

google "linux iscsi performance tuning" and "linux network stack
performance tuning" will give you instructions!

Jack

2011/3/31 Paul Viney <pa...@di...>:
> Dear list,
>
> I'm new to scst and I have a performance related question I can't find in the
> documentation.
>
> On my scst target, running 'hdparm -t /dev/vg/exportdisk' gives me
> Timing buffered disk reads:  2224 MB in  3.00 seconds = 741.21 MB/sec
> I'm running scst 2.0.0.1, iscsi-scst 2.0.0 on gentoo linux, running kernel
> 2.6.36-gentoo-r5 with the scst/iscsi-scst patches applied.
>
> On my Gentoo Linux initiator system, running open-iscsi, reading the same disk
> over iscsi with hdparm gives me
> Timing buffered disk reads:  728 MB in  3.00 seconds = 242.50 MB/sec
>
> The 2 systems are connected by a dedicated 10Gb ethernet link. Ethtool claims
> that it's actually running at Speed: 10000Mb/s, Duplex: Full
>
> My question is, would I expect a drop from 728Mb to 242.50Mb over that type of
> link, or is there anything I can to do tweak it. I'm fairly new to this, but
> it's unclear to me where the bottleneck is.
>
>
> Any advice would be much appreciated.
>
> Thanks,
> Paul Viney
>
> ------------------------------------------------------------------------------
> Create and publish websites with WebMatrix
> Use the most popular FREE web apps or write code yourself;
> WebMatrix provides all the features you need to develop and
> publish your website. http://p.sf.net/sfu/ms-webmatrix-sf
> _______________________________________________
> Scst-devel mailing list
> Scs...@li...
> https://lists.sourceforge.net/lists/listinfo/scst-devel
>