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[PATCH v3] console/serial: bump buffer from 16K to 128K
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Date: Tue, 19 Sep 2023 14:51:18 +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>
- Delivery-date: Tue, 19 Sep 2023 12:52:16 +0000
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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 128K 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 128K 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>
--
Changes since v2:
- Bump to 128K.
---
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 06350c387371..1cd9cddfe1bf 100644
--- a/xen/drivers/char/Kconfig
+++ b/xen/drivers/char/Kconfig
@@ -77,13 +77,13 @@ config HAS_EHCI
config SERIAL_TX_BUFSIZE
int "Size of the transmit serial buffer"
- default 16384
+ default 131072
help
Controls the default size of the transmit buffer (in bytes) used by
the serial driver. Note the value provided will be rounded down to
the nearest power of 2.
- Default value is 16384 (16kiB).
+ Default value is 131072 (128KiB).
config XHCI
bool "XHCI DbC UART driver"
--
2.42.0
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