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[PATCH 2/2] console/serial: bump buffer from 16K to 32K
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Date: Thu, 23 Jun 2022 11:08:52 +0200
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- Cc: Roger Pau Monne <roger.pau@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Testing on a Kaby Lake box with 8 CPUs leads to the serial buffer
being filled halfway during dom0 boot, and thus a non-trivial chunk of
Linux boot messages are dropped.
Increasing the buffer to 32K does fix the issue and Linux boot
messages are no longer dropped. There's no justification either on
why 16K was chosen, and hence bumping to 32K in order to cope with
current systems generating output faster does seem appropriate to have
a better user experience with the provided defaults.
Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
xen/drivers/char/Kconfig | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/xen/drivers/char/Kconfig b/xen/drivers/char/Kconfig
index a349d55f18..a8ac667ba2 100644
--- a/xen/drivers/char/Kconfig
+++ b/xen/drivers/char/Kconfig
@@ -77,10 +77,10 @@ config HAS_EHCI
config SERIAL_TX_BUFSIZE
int "Size of the transmit serial buffer"
- default 16384
+ default 32768
help
Controls the default size of the transmit buffer (in bytes) used by
the serial driver. Note the value provided will be rounder up to
PAGE_SIZE.
- Default value is 16384 (16KB).
+ Default value is 32768 (32KB).
--
2.36.1
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