All of lore.kernel.org
 help / color / mirror / Atom feed
From: Cyril Hrubis <chrubis@suse.cz>
To: ltp@lists.linux.it
Subject: [LTP] LTP: futex_wake04 hangs forever on i386
Date: Wed, 10 Oct 2018 14:33:21 +0200	[thread overview]
Message-ID: <20181010123321.GA7875@rei> (raw)
In-Reply-To: <915e66da-a4d8-4092-98c0-02d4daaed86f@linaro.org>

Hi!
> > Ok, I guess that I understand why this is so slow, we emulate PC memory
> > mapped serial port and we go back and forth for each byte we write. And
> > I guess that we cannot do much about this.
> > 
> > Also I suppose that it could be "fixed" by switching to virtio serial
> > driver that should be able to read the whole buffer in one go.
> 
> Just as curiosity... Unfortunately, ARM QEMU does not seem to have a 
> virtio serial device (yet ?) and x86 can't have boot loaders on a virtio 
> serial device, only systemd output and console, afaik. =(.

Huh, I'm pretty sure we run aarch64 VMs with virtio serial devices.

Also AFAIC you can enable both PC serial port emulation and virtio
serial and configure the system to start console on the virtio serial
device.

-- 
Cyril Hrubis
chrubis@suse.cz

  reply	other threads:[~2018-10-10 12:33 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-08 13:21 [LTP] LTP: futex_wake04 hangs forever on i386 Naresh Kamboju
2018-10-08 13:30 ` Cyril Hrubis
2018-10-09  2:05   ` Rafael David Tinoco
2018-10-09  9:28     ` Cyril Hrubis
2018-10-09 11:45       ` Rafael David Tinoco
2018-10-09 18:49       ` Rafael David Tinoco
2018-10-09 21:06         ` [LTP] [PATCH] futex/futex_wake04.c: fix issues with hugepages and usleep Rafael David Tinoco
2018-10-10 10:43           ` Cyril Hrubis
2018-10-10 11:14             ` Rafael David Tinoco
2018-10-10 12:06               ` Cyril Hrubis
2018-10-10 11:41             ` [LTP] [PATCH v2 1/2] futex/futex_wake04.c: fix hugepages setup for test Rafael David Tinoco
2018-10-10 11:41               ` [LTP] [PATCH v2 2/2] futex/futex_wake04.c: raise delay waiting for threads Rafael David Tinoco
2018-10-10 14:20             ` [LTP] [PATCH] futex/futex_wake04.c: fix issues with hugepages and usleep Rafael David Tinoco
2018-10-11 12:23               ` Cyril Hrubis
2018-10-10 10:41         ` [LTP] LTP: futex_wake04 hangs forever on i386 Cyril Hrubis
2018-10-10 11:13           ` Rafael David Tinoco
2018-10-10 12:05             ` Cyril Hrubis
2018-10-10 12:15               ` Rafael David Tinoco
2018-10-10 12:33                 ` Cyril Hrubis [this message]
2018-10-10 12:48                   ` Rafael David Tinoco

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20181010123321.GA7875@rei \
    --to=chrubis@suse.cz \
    --cc=ltp@lists.linux.it \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.