d********e
发帖数: 1720 | 1 http://wccftech.com/amd-ryzen-performance-negatively-affected-windows-10-scheduler-bug/
"Windows 10′ scheduler correctly identifies Intel’s hyper-threads as
lesser performing than principal core threads and schedules tasks in a way
that’s takes advantage of the additional throughput without negatively
impacting performance. Unfortunately the scheduler currently is not able to
differentiate principal core threads from virtual SMT threads with Ryzen and
in fact sees 16 thread Ryzen 7 processors as processors with 16 physical
cores with equal resources per thread.
Because it does not give any preferential prioritization of scheduling tasks
to primary threads over SMT threads like it does on Intel platforms, a
massively larger percentage of tasks can and do end up getting scheduled for
a virtual SMT thread rather than a principal core thread. Resulting in
significant artificial performance degradation."
...
"If you’re on Windows 10 there are still things you can do to bypass the
scheduler issue and improve performance in specific workloads. For games you
can disable SMT and in most cases see an improvement in performance. This
in fact explains some of the performance disparities we’ve seen in some
games with SMT. If a lot of your work involves lightly threaded or a mix of
single and lightly threaded workloads we’d recommend disabling SMT until
Microsoft releases an update to address the issue. If you’re rendering or
doing some other heavy multi-threaded work you should keep SMT enabled as
this scheduler issue should not affect performance in this scenario to any
significant degree." |
z*********e
发帖数: 10149 | |
M*****d
发帖数: 78 | |
M********t
发帖数: 5032 | |
d********e
发帖数: 1720 | 5
Not a shame to know more. I post youtube this time.
This guy made a summary on how to fully take advantage of Zen:
1) Windows bug need to be fixed;
2) Software need to be written as NUMA aware.
【在 z*********e 的大作中提到】
: wccf的新闻也转，丢不丢人
|
k**0
发帖数: 19737 | 6 直接证明AMD的测试工作没有做好，连OS支持都没测完全。
除非现在你马上要用，换了我会等半年再上AMD。 |
t*******e
发帖数: 1633 | 7 Ryzen在win10 有问题的情况下跑分仍然高于6900K, 那等win10的软件问题修复了岂不
是更能把牙膏厂秒成渣了 |
d********e
发帖数: 1720 | 8 http://wccftech.com/amd-ryzen-performance-negatively-affected-windows-10-scheduler-bug/
"Windows 10′ scheduler correctly identifies Intel’s hyper-threads as
lesser performing than principal core threads and schedules tasks in a way
that’s takes advantage of the additional throughput without negatively
impacting performance. Unfortunately the scheduler currently is not able to
differentiate principal core threads from virtual SMT threads with Ryzen and
in fact sees 16 thread Ryzen 7 processors as processors with 16 physical
cores with equal resources per thread.
Because it does not give any preferential prioritization of scheduling tasks
to primary threads over SMT threads like it does on Intel platforms, a
massively larger percentage of tasks can and do end up getting scheduled for
a virtual SMT thread rather than a principal core thread. Resulting in
significant artificial performance degradation."
...
"If you’re on Windows 10 there are still things you can do to bypass the
scheduler issue and improve performance in specific workloads. For games you
can disable SMT and in most cases see an improvement in performance. This
in fact explains some of the performance disparities we’ve seen in some
games with SMT. If a lot of your work involves lightly threaded or a mix of
single and lightly threaded workloads we’d recommend disabling SMT until
Microsoft releases an update to address the issue. If you’re rendering or
doing some other heavy multi-threaded work you should keep SMT enabled as
this scheduler issue should not affect performance in this scenario to any
significant degree." |
z*********e
发帖数: 10149 | |
M*****d
发帖数: 78 | |
|
|
M********t
发帖数: 5032 | 11 这个不算bug吧
CPU后出来os不认识很正常 |
d********e
发帖数: 1720 | 12
Not a shame to know more. I post youtube this time.
This guy made a summary on how to fully take advantage of Zen:
1) Windows bug need to be fixed;
2) Software need to be written as NUMA aware.
【在 z*********e 的大作中提到】
: wccf的新闻也转，丢不丢人
|
k**0
发帖数: 19737 | 13 直接证明AMD的测试工作没有做好，连OS支持都没测完全。
除非现在你马上要用，换了我会等半年再上AMD。 |
t*******e
发帖数: 1633 | 14 Ryzen在win10 有问题的情况下跑分仍然高于6900K, 那等win10的软件问题修复了岂不
是更能把牙膏厂秒成渣了 |
s*******n
发帖数: 201 | 15 HT的两个线程真有一主一副? 一直以为软件看来是对称的 必须靠别的Hint来保证轻载
的时候跳着用之类的
to
and
tasks
【在 d********e 的大作中提到】
: http://wccftech.com/amd-ryzen-performance-negatively-affected-windows-10-scheduler-bug/
: "Windows 10′ scheduler correctly identifies Intel’s hyper-threads as
: lesser performing than principal core threads and schedules tasks in a way
: that’s takes advantage of the additional throughput without negatively
: impacting performance. Unfortunately the scheduler currently is not able to
: differentiate principal core threads from virtual SMT threads with Ryzen and
: in fact sees 16 thread Ryzen 7 processors as processors with 16 physical
: cores with equal resources per thread.
: Because it does not give any preferential prioritization of scheduling tasks
: to primary threads over SMT threads like it does on Intel platforms, a
|
n***t
发帖数: 8357 | 16
呵呵。你选PC都按跑分选？
【在 t*******e 的大作中提到】
: Ryzen在win10 有问题的情况下跑分仍然高于6900K, 那等win10的软件问题修复了岂不
: 是更能把牙膏厂秒成渣了
|
s*******n
发帖数: 201 | 17 真需要重载多线程高性能的话牙膏的性价比没有宣传中的那么弱
其实是双方默契一边互相坑一边坑群众 苏妈卖个挑战3倍价格的乖 牙膏也不能跳出来
说自己常年双重价格 只能忍气吞声黑了就黑了 苏妈亦不穷追免得日后自己的服务器芯
片的margin上不去
比如苏妈抓了个1700大洋的8核牙膏产品宣传为假想敌 其实1700大洋可以买E5 2696 V4
还有找(150瓦 22个核心44个HT线程超过60兆的缓存 不需要特殊的主板/内存) 你看苏
妈会放ryzen和这个的跑分对比不?
【在 t*******e 的大作中提到】
: Ryzen在win10 有问题的情况下跑分仍然高于6900K, 那等win10的软件问题修复了岂不
: 是更能把牙膏厂秒成渣了
|
