[dm-devel] DM-Cache Writeback & Direct IO?

[Christoph Nelles]

Hi Leonardo,

I am aware that sequential IO is routed directly to the backing device. 
And I also played with the parameters like sequential_threshold and the 
write_promote_adjustment introduced in 3.14.
To test this i ran ./fio --name=test --filename=/dev/mapper/dmcache  
--rw=randwrite  --filesize=16G --bs=64k --ioengine=libaio --direct=1 
--iodepth=1000 in a endless loop.

Regards

Christoph


Am 08.07.2015 um 19:55 schrieb Leonardo Santos:
> Are you using sequential or random workload?
> It's important, since DMCache bypasses sequential I/O based on theshold.
>
>
> --
> dm-devel mailing list
> dm-devel at redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/dm-devel/attachments/20150709/0bbd2ae9/attachment.htm>