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...y to avoid this? Might need to tweak virtio interface. ] - network driver adds the packet buffer on TX ring - network driver does a kick which causes a VM exit [ mst: any way to mitigate # of VM exits here? Possibly could be done on host side as well. ] [ markmc: All of our efforts there have been on the host side, I think that's preferable than trying to do anything on the guest side. ] - Full queue: we keep a single extra skb around: if we fail to transmit, we queue it [ mst: idea to try: what does it do to...

...y to avoid this? Might need to tweak virtio interface. ] - network driver adds the packet buffer on TX ring - network driver does a kick which causes a VM exit [ mst: any way to mitigate # of VM exits here? Possibly could be done on host side as well. ] [ markmc: All of our efforts there have been on the host side, I think that's preferable than trying to do anything on the guest side. ] - Full queue: we keep a single extra skb around: if we fail to transmit, we queue it [ mst: idea to try: what does it do to...

From: Mark McLoughlin <markmc at redhat.com> hdr->csum_start is the offset from the start of the ethernet header to the transport layer checksum field. skb->csum_start is the offset from skb->head. skb_partial_csum_set() assumes that skb->data points to the ethernet header - i.e. it computes skb->csum_start...

From: Mark McLoughlin <markmc at redhat.com> We can handle receiving partial csums, so set the appropriate feature bit. Signed-off-by: Mark McLoughlin <markmc at redhat.com> Signed-off-by: Rusty Russell <rusty at rustcorp.com.au> --- drivers/net/virtio_net.c | 3 ++- 1 file changed, 2 insertions(+), 1 delet...

...Author: Mikulas Patocka <mpatocka at redhat.com> dm: send empty barriers to targets in dm_flush We should error all barriers, even empty barriers, on devices like virtio_blk which don't support them. See also: https://bugzilla.redhat.com/514901 Signed-off-by: Mark McLoughlin <markmc at redhat.com> Cc: Rusty Russell <rusty at rustcorp.com.au> Cc: Mikulas Patocka <mpatocka at redhat.com> Cc: Alasdair G Kergon <agk at redhat.com> Cc: Neil Brown <neilb at suse.de> Cc: Christoph Hellwig <hch at infradead.org> --- block/blk-core.c | 3 +-- 1 file...

...Author: Mikulas Patocka <mpatocka at redhat.com> dm: send empty barriers to targets in dm_flush We should error all barriers, even empty barriers, on devices like virtio_blk which don't support them. See also: https://bugzilla.redhat.com/514901 Signed-off-by: Mark McLoughlin <markmc at redhat.com> Cc: Rusty Russell <rusty at rustcorp.com.au> Cc: Mikulas Patocka <mpatocka at redhat.com> Cc: Alasdair G Kergon <agk at redhat.com> Cc: Neil Brown <neilb at suse.de> Cc: Christoph Hellwig <hch at infradead.org> --- block/blk-core.c | 3 +-- 1 file...

We don't really have a max tx packet size limit, so allow configuring the device with up to 64k tx MTU. Signed-off-by: Mark McLoughlin <markmc at redhat.com> --- drivers/net/virtio_net.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index e6b5d6e..71ca29c 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -613,6 +613,17 @@ s...

From: Mark McLoughlin <markmc at redhat.com> hdr->csum_start is the offset from the start of the ethernet header to the transport layer checksum field. skb->csum_start is the offset from skb->head. skb_partial_csum_set() assumes that skb->data points to the ethernet header - i.e. it computes skb->csum_start...

We don't really have a max tx packet size limit, so allow configuring the device with up to 64k tx MTU. Signed-off-by: Mark McLoughlin <markmc at redhat.com> --- drivers/net/virtio_net.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index e6b5d6e..71ca29c 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -613,6 +613,17 @@ s...

From: Mark McLoughlin <markmc at redhat.com> hdr->csum_start is the offset from the start of the ethernet header to the transport layer checksum field. skb->csum_start is the offset from skb->head. skb_partial_csum_set() assumes that skb->data points to the ethernet header - i.e. it computes skb->csum_start...

...tp://code.google.com/p/phusion-passenger/issues/detail?id=16 The mod_rails/passenger unit tests fail on FD passing, as do the Ruby 1.8.6 standard unit tests. They all fail with EBADF I've also tried this test case (with minor appropriate changes to file paths etc.) http://www.gnome.org/~markmc/code/test-descriptor-passing.c Again it works in FreeBSD 6, but not in FreeBSD 7 (albeit with ECONNREFUSED not EBADF). Any ideas? Cheers Phil

[PATCH] virtio_net: Delay dropping tx skbs Cc: Mark McLoughlin <markmc at redhat.com>, virtualization at lists.linux-foundation.org, netdev at vger.kernel.org MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200807151340.00446.rusty at rustcorp.com.au> From: Mark McLoughlin <markmc at redhat.com> On Mon, 200...

[PATCH] virtio_net: Delay dropping tx skbs Cc: Mark McLoughlin <markmc at redhat.com>, virtualization at lists.linux-foundation.org, netdev at vger.kernel.org MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200807151340.00446.rusty at rustcorp.com.au> From: Mark McLoughlin <markmc at redhat.com> On Mon, 200...

(Moved from kvm at vger to virtualization at linux-foundation, changed subject, cleaned up cc list) On Wed, 2008-12-10 at 13:02 +0100, Kay Sievers wrote: > On Wed, Dec 10, 2008 at 10:49, Mark McLoughlin <markmc at redhat.com> wrote: > > On Tue, 2008-12-09 at 19:16 +0100, Kay Sievers wrote: > >> On Tue, Dec 9, 2008 at 17:41, Mark McLoughlin <markmc at redhat.com> wrote: > >> > On Mon, 2008-12-08 at 08:46 -0600, Anthony Liguori wrote: > >> >> Mark McLoughli...

(Moved from kvm at vger to virtualization at linux-foundation, changed subject, cleaned up cc list) On Wed, 2008-12-10 at 13:02 +0100, Kay Sievers wrote: > On Wed, Dec 10, 2008 at 10:49, Mark McLoughlin <markmc at redhat.com> wrote: > > On Tue, 2008-12-09 at 19:16 +0100, Kay Sievers wrote: > >> On Tue, Dec 9, 2008 at 17:41, Mark McLoughlin <markmc at redhat.com> wrote: > >> > On Mon, 2008-12-08 at 08:46 -0600, Anthony Liguori wrote: > >> >> Mark McLoughli...

I found guestfs_compress_out do the compression to gzip, bzip2, compress...etc. I want to compress qcow2, and I found details about qcow2 compression in https://people.gnome.org/~markmc/qcow-image-format.html The QCOW format supports compression by allowing each cluster to be > independently compressed with zlib. Can I do that with guestfs_compress_out?

(I know you already have this, but included for completeness) From: Mark McLoughlin <markmc at redhat.com> We can handle receiving partial csums, so set the appropriate feature bit. Signed-off-by: Mark McLoughlin <markmc at redhat.com> Signed-off-by: Rusty Russell <rusty at rustcorp.com.au> --- drivers/net/virtio_net.c | 3 ++- 1 file changed, 2 insertions(+), 1 delet...

From: Mark McLoughlin <markmc at redhat.com> lguest (in rusty's use-tun-ringfd patch) assumes that the guest has updated its feature bits before setting its status to VIRTIO_CONFIG_S_DRIVER_OK. That's pretty reasonable, so let's make it so. Signed-off-by: Mark McLoughlin <markmc at redhat.com> Signed-off...

2.6.25-stable review patch. If anyone has any objections, please let us know. ------------------ From: Mark McLoughlin <markmc at redhat.com> commit 23cde76d801246a702e7a84c3fe3d655b35c89a1 upstream. hdr->csum_start is the offset from the start of the ethernet header to the transport layer checksum field. skb->csum_start is the offset from skb->head. skb_partial_csum_set() assumes that skb->data points to...

From: Mark McLoughlin <markmc at redhat.com> lguest (in rusty's use-tun-ringfd patch) assumes that the guest has updated its feature bits before setting its status to VIRTIO_CONFIG_S_DRIVER_OK. That's pretty reasonable, so let's make it so. Signed-off-by: Mark McLoughlin <markmc at redhat.com> Signed-off...