Hi, I'm observing a nasty and strange behaviour with OpenSSH (SSH-2.0-OpenSSH_3.7.1p2) on Solaris 8 (Sparc). I searched the FAQ and list archive and I didn't find anything about it. The problem is that uploading through sftp is tremendously slow (~ 0.2KB/s) while downloading is ok (~ 200-300 KB/s), so I'm quite surprised. The machines I tested (client & server) are all in the same LAN segment, so we can safely assume that no router / traffic shapper is intercepting the SSH communication. Is this problem known or at least could you point to some checks I could do to diagnose and solve the problem? Thanks in advance. -Roman PS: Please, cc to me, since I'm not subscribed to the list.
Roman Medina-Heigl Hernandez wrote:> I'm observing a nasty and strange behaviour with OpenSSH > (SSH-2.0-OpenSSH_3.7.1p2) on Solaris 8 (Sparc). I searched the FAQ and > list archive and I didn't find anything about it. > > The problem is that uploading through sftp is tremendously slow (~ > 0.2KB/s) while downloading is ok (~ 200-300 KB/s), so I'm quite surprised. > The machines I tested (client & server) are all in the same LAN segment, > so we can safely assume that no router / traffic shapper is intercepting > the SSH communication.I've seen one other report of slow SSH on a LAN with Solaris hosts. We never got to the bottom of it, but we found a workaround by disabling the Nagle algorithm (TCP_NODELAY) on the connection. You can try this by editting the set_nodelay function in misc.c and add the line at the bottom: /* disable nagle on socket */ void set_nodelay(int fd) { int opt; socklen_t optlen; return; /* add this line */ -- Darren Tucker (dtucker at zip.com.au) GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4 37C9 C982 80C7 8FF4 FA69 Good judgement comes with experience. Unfortunately, the experience usually comes from bad judgement.
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