Re: [PATCH] vhost: fix performance on LE hosts

2015-10-27 Thread David Miller
From: "Michael S. Tsirkin" Date: Tue, 27 Oct 2015 11:37:39 +0200 > commit 2751c9882b947292fcfb084c4f604e01724af804 ("vhost: cross-endian > support for legacy devices") introduced a minor regression: even with > cross-endian disabled, and even on LE host, vhost_is_little_endian is > checking is_le

Re: [PATCH] vhost: fix performance on LE hosts

2015-10-27 Thread Michael S. Tsirkin
On Tue, Oct 27, 2015 at 06:32:55AM -0700, David Miller wrote: > From: "Michael S. Tsirkin" > Date: Tue, 27 Oct 2015 11:37:39 +0200 > > > commit 2751c9882b947292fcfb084c4f604e01724af804 ("vhost: cross-endian > > support for legacy devices") introduced a minor regression: even with > > cross-endian

Re: [PATCH] vhost: fix performance on LE hosts

2015-10-27 Thread David Miller
From: "Michael S. Tsirkin" Date: Tue, 27 Oct 2015 11:37:39 +0200 > commit 2751c9882b947292fcfb084c4f604e01724af804 ("vhost: cross-endian > support for legacy devices") introduced a minor regression: even with > cross-endian disabled, and even on LE host, vhost_is_little_endian is > checking is_le

Re: [PATCH] vhost: fix performance on LE hosts

2015-10-27 Thread Greg Kurz
On Tue, 27 Oct 2015 11:37:39 +0200 "Michael S. Tsirkin" wrote: > commit 2751c9882b947292fcfb084c4f604e01724af804 ("vhost: cross-endian > support for legacy devices") introduced a minor regression: even with > cross-endian disabled, and even on LE host, vhost_is_little_endian is > checking is_le fl

[PATCH] vhost: fix performance on LE hosts

2015-10-27 Thread Michael S. Tsirkin
commit 2751c9882b947292fcfb084c4f604e01724af804 ("vhost: cross-endian support for legacy devices") introduced a minor regression: even with cross-endian disabled, and even on LE host, vhost_is_little_endian is checking is_le flag so there's always a branch. To fix, simply check virtio_legacy_is_li