From 9c4d94dc9a64426d2fa0255097a3a84f6ff2eebe Mon Sep 17 00:00:00 2001 From: Christian Schoenebeck Date: Sat, 4 Sep 2021 17:12:51 +0200 Subject: net/9p: increase default msize to 128k Let's raise the default msize value to 128k. The 'msize' option defines the maximum message size allowed for any message being transmitted (in both directions) between 9p server and 9p client during a 9p session. Currently the default 'msize' is just 8k, which is way too conservative. Such a small 'msize' value has quite a negative performance impact, because individual 9p messages have to be split up far too often into numerous smaller messages to fit into this message size limitation. A default value of just 8k also has a much higher probablity of hitting short-read issues like: https://gitlab.com/qemu-project/qemu/-/issues/409 Unfortunately user feedback showed that many 9p users are not aware that this option even exists, nor the negative impact it might have if it is too low. Link: http://lkml.kernel.org/r/61ea0f0faaaaf26dd3c762eabe4420306ced21b9.1630770829.git.linux_oss@crudebyte.com Link: https://lists.gnu.org/archive/html/qemu-devel/2021-03/msg01003.html Signed-off-by: Christian Schoenebeck Signed-off-by: Dominique Martinet --- net/9p/client.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/9p') diff --git a/net/9p/client.c b/net/9p/client.c index 1cb255587fff..213f12ed76cd 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -30,7 +30,7 @@ #define CREATE_TRACE_POINTS #include -#define DEFAULT_MSIZE 8192 +#define DEFAULT_MSIZE (128 * 1024) /* * Client Option Parsing (code inspired by NFS code) -- cgit v1.2.3