Am 24.03.2023 um 11:47 hat Florian Westphal geschrieben:
> qemu-nbd doesn't set TCP_NODELAY on the tcp socket.
>
> Kernel waits for more data and avoids transmission of small packets.
> Without TLS this is barely noticeable, but with TLS this really shows.
>
> Booting a VM via qemu-nbd on localho
Eric Blake wrote:
> On Fri, Mar 24, 2023 at 02:41:20PM -0500, Eric Blake wrote:
> > On Fri, Mar 24, 2023 at 11:47:20AM +0100, Florian Westphal wrote:
> > > qemu-nbd doesn't set TCP_NODELAY on the tcp socket.
>
> Replying to myself, WHY aren't we setting TCP_NODELAY on the socket?
If the applicat
On Fri, Mar 24, 2023 at 02:41:20PM -0500, Eric Blake wrote:
> On Fri, Mar 24, 2023 at 11:47:20AM +0100, Florian Westphal wrote:
> > qemu-nbd doesn't set TCP_NODELAY on the tcp socket.
Replying to myself, WHY aren't we setting TCP_NODELAY on the socket?
>
> And surprisingly, qemu IS using corking
On Fri, Mar 24, 2023 at 07:20:17PM +0100, Florian Westphal wrote:
> Kevin Wolf wrote:
> > Am 24.03.2023 um 11:47 hat Florian Westphal geschrieben:
> > > +qio_channel_set_cork(client->ioc, true);
> > > +
> > > if (ret < 0) {
> > > /* It wasn't -EIO, so, according to nbd_co_receive
On Fri, Mar 24, 2023 at 11:47:20AM +0100, Florian Westphal wrote:
> qemu-nbd doesn't set TCP_NODELAY on the tcp socket.
>
> Kernel waits for more data and avoids transmission of small packets.
> Without TLS this is barely noticeable, but with TLS this really shows.
>
> Booting a VM via qemu-nbd o
Kevin Wolf wrote:
> Am 24.03.2023 um 11:47 hat Florian Westphal geschrieben:
> > +qio_channel_set_cork(client->ioc, true);
> > +
> > if (ret < 0) {
> > /* It wasn't -EIO, so, according to nbd_co_receive_request()
> > * semantics, we should return the error to the client
Am 24.03.2023 um 11:47 hat Florian Westphal geschrieben:
> qemu-nbd doesn't set TCP_NODELAY on the tcp socket.
>
> Kernel waits for more data and avoids transmission of small packets.
> Without TLS this is barely noticeable, but with TLS this really shows.
>
> Booting a VM via qemu-nbd on localho
qemu-nbd doesn't set TCP_NODELAY on the tcp socket.
Kernel waits for more data and avoids transmission of small packets.
Without TLS this is barely noticeable, but with TLS this really shows.
Booting a VM via qemu-nbd on localhost (with tls) takes more than
2 minutes on my system. tcpdump shows
