[Bug 1318678] Re: haveged consumes 100% cpu when used with -w > 4067
Maybe one can try setting the read and write threshold to the same. The select high cpu issues didn't seem to kick in for values > 4064 when the read threshold and write threshold were set the same > 4064. eg even 4096! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1318678 Title: haveged consumes 100% cpu when used with -w > 4067 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/haveged/+bug/1318678/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1318678] Re: haveged consumes 100% cpu when used with -w > 4067
The attachment "0003-Don-t-set-a-watermark-higher-than-pool-size.patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team. [This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.] ** Tags added: patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1318678 Title: haveged consumes 100% cpu when used with -w > 4067 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/haveged/+bug/1318678/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1318678] Re: haveged consumes 100% cpu when used with -w > 4067
PS: The solved issues include launchpad bugs #1540978 (and its duplicate #915218). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1318678 Title: haveged consumes 100% cpu when used with -w > 4067 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/haveged/+bug/1318678/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1318678] Re: haveged consumes 100% cpu when used with -w > 4067
Hi, This has been fixed, along with a number of other issues, in the Debian package. I attached the relevant patch, but you might want to consider tracking the upstream Debian package. Best, nicoo ** Patch added: "0003-Don-t-set-a-watermark-higher-than-pool-size.patch" https://bugs.launchpad.net/ubuntu/+source/haveged/+bug/1318678/+attachment/4695942/+files/0003-Don-t-set-a-watermark-higher-than-pool-size.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1318678 Title: haveged consumes 100% cpu when used with -w > 4067 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/haveged/+bug/1318678/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1318678] Re: haveged consumes 100% cpu when used with -w > 4067
Hi, There is a possible race condition with the device file and the select command. We have had a very sketchy attempt at a fix at ( this is not a complete fix as much as working with the observed issue ): https://github.com/Openand-I/haveged/tree/oi The main changes can be summarized as: Generic Linux based OS: - Create a new random device at /dev/entropy/random to mitigate possible file based locking issues - Simply restrict write_wakeup_threshold to 4064 in the code itself. - Change select to epoll. This has the added advantage of blocking till there is any actual entropy depletion, immediately replenishing the pool upon every use. It therefore does not loop when no entropy is required. - Two epolls, one for reading and one for writing. - Overflowing the pool with an extra byte. There is some strange reasoning behind this as it kinda sorta releases the entropy gathered by the kernel till time. Android specific: - Sleep upon device sleep - Every 4 hours, a simple touch to the threshold parameters file again kinda sorta feels like releases entropy gathered by kernel till time. This can possibly be solved in Linux ( which doesn't sleep ) by setting read_wakeup_threshold to 8. Works excellent. Verified using strace. There some very distinct usability improvements on both Android and Linux, including GUI responsiveness and network connectivity due to faster random number generation. Will almost certainly help virtual machines too as they are entropy starved. Invited author to take a look at this. There is still the problem of a very slow (u)random device that slows the entire Linux ecosystem down. It is recommended instead to replace the (u)random device according to the fortuna ( at least 5x faster ) patch at: http://jlcooke.ca/random Thanks. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1318678 Title: haveged consumes 100% cpu when used with -w > 4067 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/haveged/+bug/1318678/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1318678] Re: haveged consumes 100% cpu when used with -w > 4067
This also affects me. It's 2016, still no changes, it seems. - Ubuntu 14.04.4 LTS (Server) (32-bit i686) - haveged 1.7c-1 - 4067 entropy_avail, 4096 poolsize - 4.2.0-27-generic ** Bug watch added: Debian Bug tracker #740117 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=740117 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1318678 Title: haveged consumes 100% cpu when used with -w > 4067 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/haveged/+bug/1318678/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1318678] Re: haveged consumes 100% cpu when used with -w > 4067
note: same bug reported here: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=740117 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1318678 Title: haveged consumes 100% cpu when used with -w > 4067 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/haveged/+bug/1318678/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1318678] Re: haveged consumes 100% cpu when used with -w > 4067
Same on 14.04 with haveged 1.9.1 and 3.19.0-31-generic #36~14.04.1-Ubuntu kernel. 4067 is a maximum. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1318678 Title: haveged consumes 100% cpu when used with -w > 4067 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/haveged/+bug/1318678/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1318678] Re: haveged consumes 100% cpu when used with -w 4067
It may be the 'nbytes1' line. It can perhaps be changed to 'nbytes8'. A few sleep commands in the loop are also not a bad idea either. In either case, we've had a very cursory attempt at: https://github.com/Openand-I/haveged/commit/a71df191b15a610140e420f2f17da558e6ebca08 Specifically around lines: 558, 568 for an idea of what we did to solve the issue on Android and Ubuntu. BTW, great usability improvements can be seen simply by freeing up the entropy collection from user input. Cursory, pun intended :) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1318678 Title: haveged consumes 100% cpu when used with -w 4067 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/haveged/+bug/1318678/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1318678] Re: haveged consumes 100% cpu when used with -w 4067
Status changed to 'Confirmed' because the bug affects multiple users. ** Changed in: haveged (Ubuntu) Status: New = Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1318678 Title: haveged consumes 100% cpu when used with -w 4067 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/haveged/+bug/1318678/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1318678] Re: haveged consumes 100% cpu when used with -w 4067
I have exact the same issue. Ubuntu Server 14.04.1 LTS haveged 1.7c-1 (amd64) kernel 3.13.0-40-generic (64-bit) As workaround I've set it to 3072, which works fine. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1318678 Title: haveged consumes 100% cpu when used with -w 4067 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/haveged/+bug/1318678/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1318678] Re: haveged consumes 100% cpu when used with -w 4067
Maybe worth to mention: After I've set it to 3072 entropy_avail now commutes between 3150 and 3300 in very short cycles (15-30 seconds), which it shouldn't be to expect either. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1318678 Title: haveged consumes 100% cpu when used with -w 4067 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/haveged/+bug/1318678/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
