linux-kernel - Re: [PATCH] kvm: irqchip: Break up high order allocations of kvm_irq_routing

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Message-ID: <5550A661.9000909@de.ibm.com>
Date:	Mon, 11 May 2015 14:53:53 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Paolo Bonzini <pbonzini@...hat.com>, Joerg Roedel <jroedel@...e.de>
CC:	Joerg Roedel <joro@...tes.org>, Gleb Natapov <gleb@...nel.org>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kvm: irqchip: Break up high order allocations of kvm_irq_routing_table

Am 11.05.2015 um 14:50 schrieb Christian Borntraeger:

> s390 has a route per device, but with 100 virtio-blk devices the difference seem
> pretty much on the "dont care" side. qemu aio-poll/drain code seems to cause
> much more delay since we elimited the kernel delays by using 
> synchronize_srcu_expedited.

This is ambiguous:
My point is: qemu did not get slower, it was already slow and the kernel got fast
enough that it is no longer the slowest part.

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