# Issue with memory allocation **URL:** \ **Category:** Support\ **Created:** [February 3, 2023, 7:18am UTC](https://discuss.pynq.io/t/issue-with-memory-allocation/5184 "2023-02-03T07:18:22Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![dbnyxrxp](https://avatars.discourse-cdn.com/v4/letter/d/e5b9ba/32.png) [@dbnyxrxp](https://discuss.pynq.io/u/dbnyxrxp)\ **Post date:** [February 3, 2023, 7:18am UTC](https://discuss.pynq.io/t/issue-with-memory-allocation/5184/1 "2023-02-03T07:18:22Z")
I’m using kria kv260 which has 4GB of ram and when I do `free -m`: > total used free shared buff/cache available > Mem: 3906 327 3204 3 374 3417 > Swap: 0 0 0 As you see I have 3GB free but when I try to allocate 2080MB it fails: `allocate(shape=(272629760,), dtype=np.uint64)` Error Message: > RuntimeError: Allocate failed: 4294967295 I have 272629760 items which are 64bit so (272629760 \* 64) == 2080MB, But it fails to allocate. What am I missing? ---
**Author:** ![marioruiz](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/marioruiz/32/2177_2.png) [@marioruiz](https://discuss.pynq.io/u/marioruiz)\ **Post date:** [February 3, 2023, 10:19am UTC](https://discuss.pynq.io/t/issue-with-memory-allocation/5184/2 "2023-02-03T10:19:09Z")
Hi @dbnyxrxp, Welcome to the PYNQ community. `allocate` needs Contiguous Memory Allocator (CMA) to work. In the KV260 the cma is configured to be around 1000M. You can check this with `cat /proc/cmdline`, you will see cma=1000M If you request to `allocate` more than 1000M, it will fail as there is no enough contiguous memory memory available. You may be able to change the kernel bootargs to get more cma memory. [https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/2363129857/Getting+Started+with+Certified+Ubuntu+22.04+LTS+for+Xilinx+Devices#[inlineExtension]Changing-the-Kernel-bootargs-Used-By-U-Boot](https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/2363129857/Getting+Started+with+Certified+Ubuntu+22.04+LTS+for+Xilinx+Devices#%5BinlineExtension%5DChanging-the-Kernel-bootargs-Used-By-U-Boot) For further support on CMA, I would suggest the Xilinx forums. Mario ---
**Author:** ![dbnyxrxp](https://avatars.discourse-cdn.com/v4/letter/d/e5b9ba/32.png) [@dbnyxrxp](https://discuss.pynq.io/u/dbnyxrxp)\ **Post date:** [February 3, 2023, 11:51am UTC](https://discuss.pynq.io/t/issue-with-memory-allocation/5184/3 "2023-02-03T11:51:04Z")
I changed the args but still get the same error: > root@kria:/# cat /proc/cmdline > cma=2800M earlycon root=LABEL=writable rootwait console=ttyPS1,115200 console=tty1clk\_ignore\_unused uio\_pdrv\_genirq.of\_id=generic-uio xilinx\_tsn\_ep.st\_pcp=4 cma=1000M quiet splash cma=2800M > root@kria:/# cat /etc/default/flash-kernel > LINUX\_KERNEL\_CMDLINE=“quiet splash cma=2800M” > LINUX\_KERNEL\_CMDLINE\_DEFAULTS=“cma=2800M” ---
**Author:** ![marioruiz](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/marioruiz/32/2177_2.png) [@marioruiz](https://discuss.pynq.io/u/marioruiz)\ **Post date:** [February 7, 2023, 10:16am UTC](https://discuss.pynq.io/t/issue-with-memory-allocation/5184/4 "2023-02-07T10:16:48Z")
Hi @dbnyxrxp, I suggest you post your question on the Xilinx forums. Increasing CMA for the KV260 Ubuntu SD card image is outside of the scope of this forum. Mario ---
**Author:** ![dbnyxrxp](https://avatars.discourse-cdn.com/v4/letter/d/e5b9ba/32.png) [@dbnyxrxp](https://discuss.pynq.io/u/dbnyxrxp)\ **Post date:** [February 7, 2023, 1:43pm UTC](https://discuss.pynq.io/t/issue-with-memory-allocation/5184/5 "2023-02-07T13:43:45Z")
Thank you, even though I still face the issue but your answer got me on the track. ---
**Author:** ![marioruiz](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/marioruiz/32/2177_2.png) [@marioruiz](https://discuss.pynq.io/u/marioruiz)\ **Post date:** [February 7, 2023, 3:29pm UTC](https://discuss.pynq.io/t/issue-with-memory-allocation/5184/6 "2023-02-07T15:29:22Z")