control: tag -1 + moreinfo On 2016-04-22 11:11, Mattia Rizzolo wrote: > control: reassign -1 libc6 2.19-18+deb8u4 > > On Fri, Apr 22, 2016 at 06:27:34PM +0800, jian wang wrote: > > Package: lib6 > > lost a 'c' :) > reassigning. > > > Version: 2.19-18+deb8u4 > > Severity: important > > > > vDSO is not in effect in static linked executable on jessie. This is > > not the case with wheezy. > > > > We build binary to run on both wheezy and jessie, so -static. When > > building platform is wheezy, vdso works fine, but jessie the opposite. > > > > This leads to performance hit. Unfortunately, we use g++ 4.9 for some > > application, so wheezy can't be used as build platform. There is not of information about your environment, so given what you describe, it seems you are using an i386 installation. The vDSO support requires at least a i686 CPU, while Debian i386 targets i586. When using dynamic linking, one can install libc6-i686 which provides an i686 optimized version of the libc, therefore with vDSO support. It is automatically loaded if the CPU supports it. In your case, given you use static linking, the i586 version of the libc is used, and it therefore doesn't support vDSO . That is true on wheezy, jessie, stretch, sid. I don't believe this is a regression, and in addition I can't reproduce it. Aurelien -- Aurelien Jarno GPG: 4096R/1DDD8C9B aurelien@aurel32.net http://www.aurel32.net
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