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

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Message-ID: <5550AE3E.6060705@redhat.com>
Date:	Mon, 11 May 2015 15:27:26 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Christian Borntraeger <borntraeger@...ibm.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



On 11/05/2015 14:53, Christian Borntraeger wrote:
> 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.

Great, I'll apply the patch.

Paolo

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