Performance hit in case of high delay(100ms in my case) can be easily seen with
following data
Delay - . 2 ms ReadSpeed(measured using dd) - 114 MB/s
Delay - 100 ms ReadSpeed(measured using dd) - 2.1 MB/s
From: Paul Clements
Sent: Tuesday, April 2, 2013 12:11 AM
To: Rohan Sharma
Cc: [email protected]
I'm looking at this right now. I just need to test and decide what the
default should be, and I'll send this upstream.
Thanks,
Paul
On Mon, Apr 1, 2013 at 1:45 PM, Rohan Sharma <[email protected]> wrote:
> My last message didn’t show up properly due to some formatting errors.
> So, I am sending it again
>
> I am using nbd over high latency network (100 ms ).
> Currently maximum size of nbd io operation(amount of data fetched in one
> request)
> I can achieve is 130kb and it gives very poor disk performance.
> I tried recompiling nbd driver code so as to increase max_sector_kb property
> of disk queue.
> I added following two lines to nbd_init function
> blk_queue_max_hw_sectors(disk->queue, 65536);
> disk->queue->limits.max_sectors = 4096;
> But these modifications changed nothing.
> Do you have any idea what can I do to increase size of nbd io operations?
> I would like it to go as high as 4MB.
>
> Thanks
>
>
>
>
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Rise to greatness in Intel's independent game demo contest.
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on Steam. $5K grand prize plus 10 genre and skill prizes.
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