I am still using 8.04 so yes, it is still an important issue for me. It
is unrealistic to upgrade 5 or 6 versions of Ubuntu just to test this,
since upgrading all associated applications, scripts, maintenance
methods, etc. would be required.
Please note that this bug was filed over 2 years ago and no progress has
been made.
-Mike
On Apr 27, 2011, at 8:38 PM, bugbot wrote:
> This bug report was filed against an old version of Ubuntu.
> Can you confirm whether this is still an issue in natty?
>
> If you don't mind, it would be very helpful if you could update the bug
> report in launchpad to 'Fix Released' if it is no longer an issue for
> you, or if it is still occurring under natty, please tag the bug 'natty'
> so it's easier for us to track.
>
>
> ** Changed in: libx11 (Ubuntu)
> Status: Confirmed => New
>
> ** Changed in: libx11 (Ubuntu)
> Status: New => Incomplete
>
> --
> You received this bug notification because you are a direct subscriber
> of the bug.
> https://bugs.launchpad.net/bugs/320150
>
> Title:
> X11 clients use blocking sockets causing large drawing times
>
> Status in “libx11” package in Ubuntu:
> Incomplete
>
> Bug description:
> Binary package hint: libx11-6
>
> Description: Ubuntu 8.04.2
> Release: 8.04
>
> libx11-6:
> Installed: 2:1.1.3-1ubuntu2
> Candidate: 2:1.1.3-1ubuntu2
> Version table:
> *** 2:1.1.3-1ubuntu2 0
> 500 http://us.archive.ubuntu.com hardy/main Packages
> 100 /var/lib/dpkg/status
>
> Symptoms: very slow drawing times for text strings in X clients,
> restored to normal if mouse moves over the X client's window while
> drawing. Originally seen in charts produced in the scilab
> application, but underlying problem appears to exist in all X clients
> due to Hardy X11 runtime library problem. This problem did not exist
> in Gutsy (I recently upgraded).
>
> Cause: strace shows that X clients under Ubuntu 8.04 do not set X
> client-server socket's TCP_NODELAY option. Therefore X server can
> potentially wait until X server's timeout before sending ACK packet
> back to X client. This occurs in some (or all) X text drawing
> commands which do not require a reply, therefore waiting for the ACK
> until the next packet happens to be sent from X server back to X
> client. Under Windows this delay is 200 ms, causing extremely slow
> drawing times if the window contains a lot of text. ACK delay under
> Hardy is very small (< 1 ms), making this issue imperceptible when X
> server is also running (displaying) on a Hardy machine.
>
> Strace run on Ubuntu 8.04 contains this trace for opening the socket
> to the X server:
>
> 6246 socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) = 3
> 6246 connect(3, {sa_family=AF_INET, sin_port=htons(6000),
> sin_addr=inet_addr("192.168.0.14")}, 16) = 0
> 6246 getpeername(3, {sa_family=AF_INET, sin_port=htons(6000),
> sin_addr=inet_addr("192.168.0.14")}, [16]) = 0
>
>
> The same startup on RedHat:
>
> [pid 8014] socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3
> [pid 8014] setsockopt(3, SOL_TCP, TCP_NODELAY, [1], 4) = 0
> [pid 8014] setsockopt(3, SOL_SOCKET, SO_KEEPALIVE, [1], 4) = 0
> [pid 8014] connect(3, {sa_family=AF_INET, sin_port=htons(6000),
> sin_addr=inet_addr("192.168.0.14")}, 16) = 0
> [pid 8014] getpeername(3, {sa_family=AF_INET, sin_port=htons(6000),
> sin_addr=inet_addr("192.168.0.14")}, [16]) = 0
>
>
> Note the lack of setsockopt() calls in Hardy. The missing setsockopt()
> calls occur in apparently all Hardy X clients, including (for example) xterm,
> therefore I am *guessing* at this point that the problem occurs in the base
> X11 client library.
>
>
> How to duplicate:
>
> strace -f -e trace=network,read,write,open,close -o ./strace.out
> /usr/bin/scilab -nw
> plot(1:10,1:10,'-m');
>
> Notice the very slow drawing times for axes labels (text).
>
> Look in strace.out file for the lines above.
>
> Run same strace command under Gutsy or under other Linux versions
> (such as RedHat, etc.).
>
> Strace shows the same difference in setsockopt() calls for any other X
> client starting, such as xterm.
>
> [lspci]
> 00:00.0 Host bridge [0600]: Intel Corporation 82G33/G31/P35/P31 Express DRAM
> Controller [8086:29c0] (rev 02)
> Subsystem: Micro-Star International Co., Ltd. Unknown device [1462:7338]
> 01:00.0 VGA compatible controller [0300]: nVidia Corporation G72 [GeForce
> 7300 SE] [10de:01d3] (rev a1) (prog-if 00 [VGA controller])
> Subsystem: eVga.com. Corp. Unknown device [3842:c428]
>
> To unsubscribe from this bug, go to:
> https://bugs.launchpad.net/ubuntu/+source/libx11/+bug/320150/+subscribe
>
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https://bugs.launchpad.net/bugs/320150
Title:
X11 clients use blocking sockets causing large drawing times
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