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From: | Paolo Bonzini |
Subject: | Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO" |
Date: | Sat, 30 May 2015 15:21:30 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 29/05/2015 13:11, Andrey Korolyov wrote: > Sorry for a potential thread hijack, but I`m curious about the reasons > to not making advertised queue depth for non-passthrough backends an > independent tunable, is there any concerns behind that? It certainly can be made tunable. Usually it is bounded actually, for example PATA has a queue depth of 1 (!) while AHCI has 32. For virtio (blk and scsi) it actually is already somewhat tunable, since the queue depth is limited by the size of the virtqueue. Paolo
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