fischer@transporeon.com writes:
> When I do a select * of a table with some xml-data (about 50 MB) in a
> text-field it will take ages to get a result, because wireshark is
> recognizing some kind of packet defragmentation, so these packets have will
> be sent over and over again.
If that is actually what's happening, you need to file a bug against your
kernel; such behavior is far outside Postgres' control.
regards, tom lane
