On Apr 15, 2019, at 11:37 AM, Alex McWhirter <alex@triadic.us> wrote:

I went in and disabled TCP offload on all the nics, huge performance boost. went from 110MB/s to 240MB/s seq writes, reads lost a bit of performance going down to 680MB/s, but that's a decent trade off. Latency is still really high though, need to work on that. I think some more TCP tuning might help.

 

Those changes didn't do a whole lot, but i ended up enabling performance.read-ahead on the gluster volume. my blockdev read ahead values were already 8192, which seemed good enough. Not sure if ovirt set those, or if it's just the defaults of my raid controller.

Anyways up to 350MB/s writes, 700MB/s reads. Which so happens to correlate with the saturation of my 10G network. Latency is still a slight issue, but at least now im not blocking :)

 

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