Alberto García

O Grove (Spain)

One of the founding members of Igalia, Alberto loves computing since he got his first ZX Spectrum in the early nineties.

Latest Updates

Alberto García 16/11/2017

“Improving the performance of the qcow2 format” at KVM Forum 2017

I was in Prague last month for the 2017 edition of the KVM Forum. There I gave a talk about some of the work that I’ve been doing this year to improve the qcow2 file format used by QEMU for storing disk images. The focus of my work is to make qcow2...

Alberto García 08/02/2017

QEMU and the qcow2 metadata checks

When choosing a disk image format for your virtual machine one of the factors to take into considerations is its I/O performance. In this post I’ll talk a bit about the internals of qcow2 and about one of the aspects that can affect its performance...

Alberto García 24/05/2016

I/O bursts with QEMU 2.6

QEMU 2.6 was released a few days ago. One new feature that I have been working on is the new way to configure I/O limits in disk drives to allow bursts and increase the responsiveness of the virtual machine. In this post I’ll try to explain how it...

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block: Freeze the backing chain for the duration of the stream job

block: Freeze the backing chain for the duration of the stream job Signed-off-by: Alberto Garcia Signed-off-by: Kevin Wolf

Alberto García13/03/2019

block: Freeze the backing chain for the duration of the mirror job

block: Freeze the backing chain for the duration of the mirror job Signed-off-by: Alberto Garcia Signed-off-by: Kevin Wolf

Alberto García13/03/2019

block: Freeze the backing chain for the duration of the commit job

block: Freeze the backing chain for the duration of the commit job Signed-off-by: Alberto Garcia Signed-off-by: Kevin Wolf

Alberto García13/03/2019

block: Allow freezing BdrvChild links

block: Allow freezing BdrvChild links Our permission system is useful to define what operations are allowed on a certain block node and includes things like BLK_PERM_WRITE or BLK_PERM_RESIZE among others. One of the permissions is BLK_PERM_GRAPH_MOD...

Alberto García13/03/2019

qcow2: Default to 4KB for the qcow2 cache entry size

qcow2: Default to 4KB for the qcow2 cache entry size QEMU 2.12 (commit 1221fe6f636754ab5f2c1c87caa77633e9123622) introduced a new setting called l2-cache-entry-size that allows making entries on the qcow2 L2 cache smaller than the cluster size. I have...

Alberto García09/03/2019