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net/stream: skip automatic zero-init of large array

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The 'net_stream_send' method has a 68k byte array used for copying
data between guest and host. Skip the automatic zero-init of this
array to eliminate the performance overhead in the I/O hot path.

The 'buf1' array will be fully initialized when reading data off
the network socket.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Message-id: 20250610123709.835102-32-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2025-06-10 13:37:09 +01:00 • committed by Stefan Hajnoczi
parent 751b0e79f1
commit 837b87c4c5
1 changed files with 1 additions and 1 deletions
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net/stream.c
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@ -148,7 +148,7 @@ static gboolean net_stream_send(QIOChannel *ioc,
NetStreamState *s = data;
int size;
int ret;
char buf1[NET_BUFSIZE];
QEMU_UNINITIALIZED char buf1[NET_BUFSIZE];
const char *buf;
size = qio_channel_read(s->ioc, buf1, sizeof(buf1), NULL);